Boundaries

Definition

In Shirley Ardener's usage, boundaries are the perimeters of categories — spatial and social at once — whose significance is analytic before it is architectural. A boundary is not a wall but a rule-system: "A restricted area like a club, a theatre or a nation-state has a set of rules to determine how its boundary shall be crossed and who shall occupy that space. Those who enter it will share certain defining features: they will perhaps have met specific criteria of club membership, bought a ticket or passed a citizenship test." Crossing is policed by recognition — "by a gate-keeper, such as a hall porter, an usherette or an Immigration Officer, or by the other members of the category." Classification systems work taxonomically, defining "'X' in contrast to 'non-X'"; the analytical attention falls on "the significance of the perimeters of the categories that we make in order to codify and confront the worlds we create." The lineage runs through Mary Douglas's Purity and Danger (1966) — boundaries as sites of pollution and taboo — and Durkheim & Mauss's Primitive Classification. Boundaries here are also topological rather than fixed: 'shape' and 'space' are used "in the sense of 'topological space,'" where "alterations in the boundaries may still preserve the integrity of the space."

This page holds the social-anthropological concept; for the political technique of spatial confinement see enclosure.

Two technological registers appear in Mark Taylor's chapter. The first dematerializes the wall itself: the Aegis Hyposurface — "the world's first responsive architectural surface" — is a pistoned metal face whose undulations were "spatially disturbing, while questioning the seeming solidity of the Aegis Hyposurface's metal surface" (Burry, via Taylor); tent canvases, soft skins, and Kuma's air-pressure-animated T-Room membrane extend variability to other "spatial variability" surfaces — boundaries as operation rather than partition. The second automates the gate: in the supermodern non-place (non-places), access is "gated and controlled by barriers, ticket machines (as on subways), and directional paths that allow access by means of network cards that identify users" — Ardener's gate-keeper replaced by sensor infrastructure that "scrutinize[s], identif[ies], and direct[s]" its users, and Fuller's textual injunctions ("turn left, insert card now") as the boundary's spoken rules.

A third register is historical and hand-operated: the Beechers' movable screen of 1869 — "the back or inside of the movable screen" fitted with wardrobe and shelf-boxes, rolling on soap-lubricated wooden rollers so that "a child can move the whole easily" (p. 46), converting "one part of the room" into "two apartments… of any desired size." Here the boundary is a furnishing with an ergonomic specification — the weakest occupant as the standard of the boundary's movability — and the "set of rules" that determine "who shall occupy that space" are re-executed by hand, at will, by the occupants themselves. The piazzas' "sliding-windows to the floor," convertible "by glazed sashes… into green-houses in winter" (p. 44), extend the register seasonally: the threshold adjusted rather than crossed. See flexible-interior.

A fourth register is constructional and disciplinary: Marc Manack's fabricated boundary. Architecture's own work on the inside/outside division is threshold-making — its methodologies "primarily concerned with… mediation of external and internal influences to construct a threshold that articulates distinctions and relationships between natural and fabricated worlds" — but interior architecture's boundary work is separation made visible: the Crystal Bridges Museum Store's wood envelope "never touch[es] the surrounding construction, with continuous reveals at the perimeter creating the effect that this element hovers within the space," holding "affinities and alignments without deference to the architecture" — the interior appearing "as a delamination from it, yet borrow[ing] the logic of the architecture to establish independence and distinctions from it." Here the boundary is not a rule crossed (Ardener), an actuated surface (Taylor), or a moved screen (Beecher), but a disclosed gap: the separation between interior construct and host architecture exhibited as perceptible thickness. See fabrication, poche.

A fifth register is socio-spatial and urban: Iain Borden's thick edge. Via Simmel — "the 'boundary is not a spatial fact with sociological consequences but a sociological fact that is formed spatially'" — the boundary "do[es] not cause sociological effects in themselves, but are formed between social elements," and is therefore "not a surface but a thick edge, a five metre deep in-between zone in which social relations are challenged and controlled through architectural materiality." Borden's two built cases calibrate the register's poles: the Holy Trinity blue screen as "a boundary of exclusion, a brutally frontal relation which physically repels" — its 45° deviation off a sitable low wall "leaving only 150 millimetres clear in front," exclusion computed from "the thickness of the human body" — and Broadgate's 'Go-Between Screens', which "leave… a 2 metre gap": "The boundary here is never sealed, operating in a manner other than physical exclusion," provoking instead the visitor's self-questioning, "'Should I be here, and now? Do I have the right of passage?'" Boundaries here are, in the Intimus editors' phrase, "permeable, temporal and political markers of bodily negotiation." See thick-edge, hostile-architecture, privatised-public-space.

A sixth register is territorial and portable: Amy Campos's boundary that is not fixed to a wall. The tapestry marks dominion in transit — "Wherever their owners took them, tapestries marked territory" — a boundary that travels with its owner from fortress to fortress and even onto the battlefield, doubling as "a virtual window to another highly embellished narrative territory." At Çatalhöyük the boundary is a section line: "The roofline acts as the territorial marker between interior and exterior – private and public – space." And the Lockheed Burbank scrim is the boundary built as an image to be misread — "paper thin fake houses, streets with rubber cars, trees, and shrubs, even laundry lines complete with drying clothes and fire hydrants" — a perimeter designed not to be crossed or negotiated but to deceive aerial surveillance, the boundary as decoy. Where Ardener's rules govern crossing, Webb's surfaces belong to both sides, and Borden's edge is negotiated in passage, Campos's boundaries are carried, drawn in section, or counterfeited. See territory, liberated-interior.

A seventh register is climatological and mechanical: the McClures' hermetic seal. Modernism's decisive boundary was produced not by law (Ardener), actuation (Taylor), hand (Beecher), construction (Manack), social negotiation (Borden), or portability (Campos) but by machine climate: "The invention of air conditioning in the early twentieth century led to many monumental changes in the constructed environment, none more or less important than an absolute boundary between inside and outside." The seal's result is the boundary as total non-relation — "the interior no longer needed to negotiate – or even acknowledge – the exterior… The building envelope became the boundary, and the object and its relative space could become entirely self-referential" — completed by occupancy classifications, fire separations, and protected egress. The register's counter-case is the prospect of the aspect: buildings whose boundaries are held "from both sides at once" ("the clarity of both being within a limited boundary… and simultaneously looking beyond and experiencing that boundary") — the envelope as tenure rather than seal. See hermetic-seal, prospect-of-the-aspect.

An eighth register is social and gendered, interior: Susan Hedges's ladies' waiting room, the boundary made of etiquette. The room is held not by its walls but by its rules: "Social roles and conventions have regulated, determined, and produced the interior; etiquettes and excluding boundaries construct and save the waiting interior, a constructed possibility of privacy." Its boundary-work is selective passage — "Some people will not pass through; it is a place for waiting and a peculiar limbo used before or after travel" — and its indeterminate character is the boundary lived from inside: "A transient population is viewed from the dark interior through to the bright light of the concourse, neither fully public nor fully private, an indeterminate character." Where Ardener's rules govern crossing and Borden's edge negotiates the body, Hedges's register shows the boundary as preserved interiority: etiquette saving "the waiting interior" for "women who wait" — a gendered, rule-bound privacy built inside the fully public concourse. See waiting-room, gendered-space, liminality.

A ninth register is oceanic and navigational: Epeli Hau'ofa's sea (via Sarah Treadwell). Pre-European Pacific boundaries inverted the Western cartographic image: "Boundaries were not imaginary lines in the ocean, but rather points of entry that were constantly negotiated and even contested. The sea was open to anyone who could navigate his way through." The boundary here is not a line but a negotiated point of entry in an open medium, known through skillful navigation — "recorded in the sand and in stick charts, precise spatial descriptions of bodies moving under a rotating sky," geometry "aligned to time." Treadwell's gloss — "The sea is porous, map-like, narrated, and figured" — makes the ocean the boundary's most fluid case: a medium whose perimeters are traversals rather than walls. See sea-of-islands, oceanic-interiority.

A tenth register is material and responsive: Winka Dubbeldam's crease. Here the boundary does not move (Beecher), regulate (Ardener), actuate (Taylor) or negotiate in passage (Borden) — it folds: "boundaries are no longer barriers but are interactive; they are creases – a hard-soft space allowing for local conditions" (p. 96). The crease is "malleable, soft, adaptable and multidimensional. Not unlike cartilage between spinal cord fragments, it allows for flexibility and precise adjustment" (p. 99) — the boundary as cartilage, disseminating "the soft in the hard and the hard in the soft" between the urban and the individual. Where the actuated wall (Taylor) changes its shape, the crease is where a continuous wrapper changes its relation: the Aida Hair Salon's smart wall "renegotiates both the urban landscape (hard space) and the private domain (soft space)," its creases opening "local insertions of cutting stations, desks and seating elements." The boundary here is a fold in a surface that belongs to both sides — the boundary as negotiation made permanent. See crease, thing-shapes, interactive-architecture.

An eleventh register is mathematical and computed: Jonathon R. Anderson & Laura Lovell-Anderson's boundary problem, reported through Janine Yeung's Gyroid reflection: "there is often an ambiguity between invisible and defined boundaries in mathematical surfaces – and this may translate to factors of the component in regards to overall geometry relating to form flexibility" (2016, p. 12). Where every other register locates the boundary in a rule (Ardener), a moved screen (Beecher), a disclosed gap (Manack), a thick edge (Borden), a carried image (Campos), a machine seal (McClure), an etiquette (Hedges), a navigated entry (Hau'ofa) or a fold (Dubbeldam), this register finds the boundary undecidable in the computation itself: a mathematical surface can fail to declare whether it encloses — the ambiguity is not in perception, law, etiquette or matter but in the geometry. See the-gyroid, surface-mathematics, systems-theory (where "boundary" is a named system characteristic: the formal, input/output sense of the edge).

A twelfth register is performative and diffused: Laura Garófalo-Khan's grotto boundaries. Here the boundary does not rule, move, reveal, negotiate, travel, seal, hold etiquette, open the sea, fold, or hesitate in computation — it performs and modulates. SOL Grotto is defined by "its focus on an interior redefined by the articulation of a performative boundary that presents a 'mediated experience of water, coolness, and light'": a wall of over a thousand glass tubes that "take on the form of a cave wall or a waterfall," deliver "cool air, provided by the Venturi effect," and "create an alternative image that dissolves the wall between the inside and the outside" — "the tubes also behave like the thick earthen boundary of the subterranean space." Bienvenidos al Sur goes further: "There is no continuous weather or thermal boundary, just a thicket… the porosity of the boundary becomes apparent. The diffused boundary modulates moisture, light, air, smell, and sound. Light pours through the pores, but the layers of leaves, like those of a tree canopy, keep the interior dry." Where every prior register divides, reveals, or negotiates, this one conditions: the boundary as the living surface through which climate, light, and smell are mediated rather than stopped. See performative-ornament, sensorial-interior-landscape, ambient-conditioning.

A thirteenth register is anti-view and interior: the men's room as arrested visual commerce (Edelman). The boundary as translucent glazing and mirrors that return the look: the room "tends to lack windows," its glass "generally precludes any visual commerce between the areas without and within," yet remains "always… designed to permit exchanges between inside and outside analogous to those that would seem most successfully arrested" — a rule-system enforced by the users' own glances. See mens-room, privacy, gaze.

A fourteenth register is tactile and phenomenal: Clare Olsen's touched boundary, via Derrida — "To touch is to touch a limit, a surface, a border, an outline" (2005, p. 103). Here the boundary is known not by crossing, actuating, negotiating, sealing, folding, or computing it, but by touching it: the tactile quality of "the boundary between architecture proper and the affective experience within it, what Gilles Deleuze refers to as the tactile-optical experience." The register's material: "The texture or smoothness of the surfaces, coolness or warmth of materials, and dance of light delineate the emotive and sensorial qualities within a space" — the interior's "vibrant border which defines the interior condition." Where every other register asks who or what governs the line, this one asks what the boundary feels like: the limit as the surface the body meets, the interior condition's defining contact. See quasi-autonomous-interior, optic-haptic-perception.

A fifteenth register is psychoanalytic: Mark Goulthorpe's boundary model, the actuated wall's conceptual warrant. Goulthorpe names the distinction his Aegis Hyposurface enacts — Ferenczi's autoplastic/alloplastic pair, "the difference between a rigid and static relationship between the environment and the self, an autoplastic rigidity, and a malleable and reciprocal alloplastic deformability" — with Bachelard's nest as the boundary's natural model: "an intricate imprint of the inhabiting body," an environment "continually recalibrated to suit the vulnerability of our relation to the environment." Where the actuated register (Taylor) describes what the responsive wall does, this register names what it is for: converting the boundary from a static limit into a reciprocal, deformable relation between self and environment. See alloplastic-space, interactive-architecture.

A sixteenth register is syntactic and social-logical: Bill Hillier and Julienne Hanson's boundary as the operator of category and control. Their claim is the wiki's most systematic statement of what a boundary is: "the dualism reflects only the dual nature of the boundary, which at one and the same time creates a category of space – the interior – and a form of control – the boundary itself." The boundary does not merely divide or rule — it reverses: the same act of boundary-drawing that constructs the settlement as a continuous aggregate creates interiors that are "a series of discrete events, expressly and explicitly disconnected from the global system" — a transpatial system (transpatial-solidarity) whose members affiliate by analogy and difference. Hence the reversal effect: "the most localised scale of spatial organisation tends to become the most global in its reference. The boundary refers to the principles of a culture." And the boundary's control is administered socially: it constructs the inhabitant–visitor interface, admitting visitors who "have a legitimate reason to cross the boundary of a building" but "no control over that building." Where Ardener's boundary is a rule, Borden's an edge, and McClure's a seal, Hillier and Hanson's boundary is a category-forming, control-bearing interface — the reason a building is "a domain of knowledge" and "a domain of control" at once (gamma-analysis, building-genotype).

An eighteenth register is envelopal and agency-bearing: Marco Vanucci's envelope as interiority's boundary-maker. "The building envelope is the diaphragm that articulates form and affects program… it organizes the interior of the building and the external public realm with which it communicates; it controls the internal environment and marks the boundary of an architectural interiority" — the boundary as the building's active skin rather than its passive edge. Its demarcation is property-political: "It demarcates the boundaries between two different spheres of control: the private and public properties" — two spheres of control, not two rooms — and it "engages with its surroundings in many different forms: economically, socially, psychologically, and politically," synthesizing "many heterogeneous inputs, including economic climate, environment, legislative norms, social organization." Where McClure's envelope-boundary is the hermetic seal (the boundary as non-relation), Vanucci's is negotiation itself: "The building envelope becomes the field of negotiation between interior spatiality and exterior appearance," "actively responsive to external stimuli as well as internal needs" — the boundary as the difference-register through which the interior is continuously re-drawn (performative-envelope). See inside-outside-dialectic, privacy.

A twentieth register is historical-diagnostic: Johan Voordouw's gradient, the boundary's past-century evolution. "The formal boundary of the interior, the interface of the inside to the outside, has in the past century theoretically and formally evolved from a defined threshold to a porous, ambiguous gradient" — the boundary no longer a line or rule but a blurred zone of continuous variation, instantiated in the topological surface whose continuity "prevents the (programmatic) definition of the interior" and whose porosity "prevents its (spatial) enclosure." The register's epistemic sting: "Knowing comes from definition; the gradient that is continually blurred is also the zone that prevents knowing" — against Leenhardt's threshold, "a zone formed by precise tectonics, an area of knowledge and even of knowability." The register's two failing edge conditions — "one is blended into the landscape… the other is a violent cut of the surface, extruded like the side of a cliff… In the former, the outside merges in; in the latter the transparent edifice puts all interiority on show" — show the gradient's inability to end. The rescue: "retain the porosity but rescind the ambiguity," with SANAA's walkway that "periodically clarify[ies]… the ambiguity of the undulating surface" as the first intimation. See threshold-to-gradient, topology, topological-interiority.

A twenty-first register is geopolitical and demographic: Hadjiyanni's fluctuating borders, the boundary as the changing condition beneath the fixed room. Interiors' fluid character "manifests itself as a social, economic, cultural, or political construct that changes and evolves in response to fluctuating borders, a multiplicity of identities, and varying layers of sense of belonging" — the perimeter that moves is not the wall (Beecher), the rule (Ardener), or the gradient (Voordouw) but the border and the category: citizenship, documentation, ethnicity, and belonging, all of which shift while walls, floors, and ceilings hold still. The register's problem is the mismatch: "What are the implications of 'falling between' for interiors, which are fixed spatialities, bounded by walls, floors, and ceilings?" — Ardener's Immigration Officer gate-keeping a boundary that has already moved, the room categorically out of joint with its occupant's category. See global-constructs, bounded-choices, transbodied-space.

A twenty-second register is sensory and temporary: Solomon/Howes/Law's olfactory cultural boundary. The boundary drawn not by rule, wall, gate, or gradient but by smell and sound: "the sounds and scents of the foreign workers, mostly Filipino, establish temporary cultural boundaries between their 'Little Manila' and the financial center" — "the politics of differing sensory strategies for making sense of the same place." Where Ardener's boundaries are rules policed by gate-keepers and Taylor's are sensors policed by infrastructure, this register's boundary polices itself by nose and ear: the Sunday occupation's sensory perimeter that both partitions the plaza (workers from financiers) and constitutes a public (the counter-public the politicians later join). The register's industrial counterpart is the mall's engineered perfume ("prodigious scents" distinguishing Armani from the domestic-workers' mall) — the boundary as sensory filter, and the city's "more substantive spatial boundaries than a ground" (Cities Without Ground). See smellscape, heterosmia, atmospheric-politics, public-sphere.

A twenty-third register is disciplinary: Gregory Marinic's boundary-breakdown, the boundary worked on at the scale of the disciplines themselves. The Reader's closing statement names the operation: interior architecture's discourse is "breaking down boundaries and distinctions between the historically siloed – and generally contentious – territories of architecture and interior design. This blurring, in turn, has restructured how we work and how design services are delivered, as well as how designers, clients, and fabricators collaborate." Where every prior register locates the boundary in a wall, rule, gradient, fold, or smell, this one locates it between disciplines — and its dissolution is not an event but a working material: "the mining of an interstitial zone between architecture and interior design," whose product is the restructuring of practice itself. The register's paradox is the boundary's defender named: conservative members of both disciplines grow "skeptical of the intentions and motivations of interior architecture," view it "through a lens of 'otherness'," and reject "the binding potentialities which interior architecture offers to their shared, building-oriented field" — the boundary policed by those on both sides of it. See disciplinary-frontiers, identity-of-the-interior.

A twenty-fifth register is minimal and everyday: J Macgregor Wise's marker, the boundary as what the unlived wall is not. The wall is "static, dull, and cold. But when lived (encountered, manipulated, touched, voiced, glanced at, practised) it radiates a milieu, a field of force, a shape of space" (p. 392) — the boundary's two states (mark and radiance) distinguished for the first time on this page. And marking itself needs no wall: "we may mark space more subtly by placing objects (a coat saves the seat), or by arranging our stuff (to make sure no one sits beside us on the bus or the bench) or even our bodies (posture opens and closes spaces; legs stretched out, newspaper up). Smoke from a cigarette marks space… as do spices and scents. Symbols also mark space from clothing style (preppie, biker, grunge) to words on a t-shirt, but also graffiti, posters, and so on" (p. 392) — the boundary drawn by coat, posture, smoke, accent and symbol, Ardener's rule-system executed by the body and its stuff rather than by an usherette. Where every other register asks who or what holds the line, Wise's asks what the line does when lived: it becomes a field — the boundary as milieu-radiator rather than divider. See milieu, home, trace.

Key Thinkers

• Shirley Ardener — boundaries as rule-governed category perimeters with gate-keepers (pp. 15–16).
• Mary Douglas — Purity and Danger (1966), the boundary/pollution framework cited as the volume's background; not yet paged (see log).
• Durkheim & Mauss — Primitive Classification (1903), cosmic and tribal space "only very imperfectly distinguished"; not yet paged (see log).
• Ferdinand de Saussure — the structural background: value defined by what a term is not; even "negative presence" structures.
• Michel Foucault — the disciplinary counterpart: enclosure, partitioning, the rules of distribution (see the power-and-space debate).
• Mark Taylor — the technological registers: the actuated wall (Aegis Hyposurface, T-Room membrane) whose variability "question[s] the seeming solidity" of the boundary; and the automated gate (barriers, ticket machines, network cards) of the supermodern non-place.
• Catharine E. Beecher & Harriet Beecher Stowe — the hand-moved register: the rolling screen as boundary-as-furnishing, engineered so "a child can move the whole easily" — the boundary's rules re-executed by the occupants themselves (p. 46).
• Marc Manack — the constructional register: the boundary as disclosed gap — the hovering envelope with "continuous reveals at the perimeter," the interior as "a delamination" from its host that "borrows the logic of the architecture to establish independence."
• Iain Borden — the socio-spatial register: the boundary as thick edge — "a sociological fact that is formed spatially" (via Simmel); the blue screen's 45°/150 mm exclusion computed from the body; the unsealed 2-metre gate gap that governs by self-questioning.
• Amy Campos — the territorial register: the portable boundary (the tapestry that "marked territory" wherever it went), the section boundary (Çatalhöyük's roofline as "the territorial marker between interior and exterior – private and public – space"), and the counterfeit boundary (the Lockheed decoy suburb built to be misread from above).
• Susan Hedges — the etiquette register: the ladies' waiting room's "etiquettes and excluding boundaries" that "construct and save the waiting interior, a constructed possibility of privacy" — the boundary as a rule-system preserving a gendered interior inside the public concourse.
• Sarah Treadwell — the oceanic register (presenting Hau'ofa): pre-European sea boundaries as "points of entry that were constantly negotiated and even contested" rather than "imaginary lines in the ocean" — boundaries as navigated traversals of an open medium.
• Winka Dubbeldam — the responsive-material register: the boundary as crease — "no longer barriers but… interactive; they are creases – a hard-soft space allowing for local conditions"; the smart wall whose creases allow "local insertions."
• Jonathon R. Anderson & Laura Lovell-Anderson — the mathematical register (presenting Janine Yeung): "there is often an ambiguity between invisible and defined boundaries in mathematical surfaces" (Yeung 2016, p. 12) — the boundary as a computed geometry's undecidable enclosure, and, in the chapter's systems vocabulary, a formal characteristic of any system (input/output edge).
• Laura Garófalo-Khan — the performative/diffused register: SOL Grotto's "performative boundary" (the tube wall that "behave[s] like the thick earthen boundary") and Bienvenidos al Sur's "diffused boundary" that "modulates moisture, light, air, smell, and sound" — the boundary as conditioning medium rather than dividing line.
• Clare Olsen — the tactile register (carrying Derrida/Deleuze): "To touch is to touch a limit, a surface, a border, an outline" — the boundary as the touched surface between architecture proper and the interior's affective experience, materialized in "texture or smoothness of the surfaces, coolness or warmth of materials, and dance of light."
• Mark Goulthorpe — the psychoanalytic register (carrying Ferenczi and Bachelard): the autoplastic/alloplastic pair as the actuated boundary's conceptual warrant — the boundary converted from static limit to "a malleable and reciprocal alloplastic deformability."
• Bill Hillier & Julienne Hanson — the syntactic register: the boundary's dual nature ("at one and the same time creates a category of space – the interior – and a form of control"), the reversal effect ("the most localised scale… the most global in its reference"), and the inhabitant–visitor interface as the boundary's social administration (1984/2006). See transpatial-solidarity, inhabitant-and-visitor, gamma-analysis.
• Marco Vanucci — the envelopal register: the envelope as "the boundary of an architectural interiority" and the demarcation "between two different spheres of control: the private and public properties" — the boundary as the building's active, negotiating skin (2018). See performative-envelope.
• Johan Voordouw — the gradient register: the boundary's past-century evolution "from a defined threshold to a porous, ambiguous gradient"; the gradient as "the zone that prevents knowing"; the two failing edge conditions (landscape-blend, violent cut); and the rescue — "retain the porosity but rescind the ambiguity" (2018). See threshold-to-gradient.
• Tasoulla Hadjiyanni — the geopolitical register: boundaries that fluctuate beneath fixed spatialities — interiors changing "in response to fluctuating borders, a multiplicity of identities, and varying layers of sense of belonging," the mismatch between the moving category and the still room (2018). See global-constructs.
• Gregory Marinic — the disciplinary register: the boundary between the disciplines as the boundary whose dissolution is the third discipline's working material — "breaking down boundaries and distinctions between the historically siloed territories"; boundary-blur as practice-restructuring ("restructured how we work and how design services are delivered") (2018).
• J Macgregor Wise — the minimal/everyday register: the marker's two states ("static, dull, and cold" vs radiating "a milieu, a field of force" when lived, p. 392); the boundary drawn without walls — "a coat saves the seat… posture opens and closes spaces… Smoke from a cigarette marks space… Symbols also mark space" (p. 392) — the body-and-stuff marking apparatus beside Ardener's rule-system (2000/2006). See milieu, home.

Related Concepts

• Partition of Space — boundaries are the partition's lines: the rules of crossing and occupation.

• Ground Rules and Social Maps — the rules by which boundaries are made on the ground.

• Enclosure — the political-architectural technique of boundary enforcement.

• Dual Symbolic Classification — the symbolic values that accumulate along boundaries (inside/outside, right/left).

• Heterotopia — Foucault's "counter-sites": spaces whose relation to other spaces is one of deviation, ordered by systems of opening and closing.

• Separate Spheres — the domestic/public boundary whose instability (Sparke) defines modernity.

• The Dialectics of Outside and Inside — the lived division that boundaries mark, but whose coefficient is value rather than geometry: the boundary wall displaced by an imagined quality.

• Exhibitionary Complex — the museum's boundary as ritual crossing: the approach that prepares deference, the route that disciplines the gaze.

• Narrative Space — the museum as bounded narrative space whose crossing initiates the story ("time traveling" through a tunnel-like passage).

• Non-Places — the boundary automated: card readers, barriers, and directional paths "that identify users" as the non-place's gate-keeping infrastructure.

• Interactive Architecture — the boundary actuated: the responsive surface as a wall that changes rather than divides.

• Crease — the boundary folded: Dubbeldam's interactive crease, the hard-soft in-between where the boundary is a permanent negotiation rather than a line or a moved element (see thing-shapes).

• Flexible Interior — the boundary as furniture: the movable screen and its lineage, the hand-operated ancestor of the actuated wall.

• Thick Edge — the boundary's socio-spatial form: the "five metre deep in-between zone" (Borden) in which relations are negotiated through materiality, temporality and the body.

• Hostile Architecture — the edge weaponised: spiked sills, sprinklers and the 45° deviation as boundary-hardening against unwanted bodies.

• Privatised Public Space — the boundary's contemporary habitat: the "spaces at once public and private" whose unsealed gates denote "the transition from public to private realms."

• Transpatial Solidarity — the social order the boundary generates: interiors affiliated by analogy and difference, held by boundary control against uncontrolled incursion (Hillier & Hanson).

• Reversal Effect — the boundary's scale paradox: the most localised interior refers to the culture's most global principles.

• Inhabitant and Visitor — the boundary's social product: the three-part order (inhabitant, visitor, stranger) every boundary constructs.

• Building Genotype — the boundary's design consequence: types as bendings of the category/control interface.

• Threshold-to-Gradient — the boundary's twentieth-century evolution: from the defined threshold to the "porous, ambiguous gradient" (Voordouw) — the boundary-form this page's registers have been tracking all along.

• Sea of Islands — the oceanic boundary-world: the open sea crossed by negotiation and navigation rather than divided by imaginary lines.

Source Support

Sources in the wiki that discuss this concept:

• The Partition of Space (Ardener 2006) — the club/theatre/nation-state boundary rules and gate-keepers (p. 15); taxonomic 'X' vs 'non-X' and the significance of perimeters (p. 15); topological space and the Regency/Victorian chair's 'conceptual slot' (note 2, p. 20); Douglas and Durkheim & Mauss in the notes (p. 20).
• The Dialectics of Outside and Inside (Bachelard 1958/2006) — the boundary's protection migrating from matter to quality: secret being "feels that it is guarded more by the whiteness of the lime-wash than by the strong walls… It is stronger than all geometry. It is a part of the cell of intimacy" (pp. 22–23) — the wall that guards is not the wall that stands.
• Symbiotic spaces (Stokes-Rees 2018) — the museum as ritualized bounded space: the approach choreographed as crossing ("the climb up to the door feels like entering a church or cathedral"), visitors "psychologically and culturally prepared to respect the 'civilising rituals' of museum visiting"; the MoM's inversion of the same rule — the gate at the bottom (underground escalator entrance) rather than the top; and the boundary's final dissolution in the closing formula ("blurring the boundaries between inside and outside… city and museum"). See exhibitionary-complex.
• Shape shifting (Taylor 2018) — two technological registers: the actuated wall ("spatially disturbing, while questioning the seeming solidity of the Aegis Hyposurface's metal surface"; Kuma's T-Room membrane "animated by variations in air pressure") and the automated gate ("gated and controlled by barriers, ticket machines (as on subways), and directional paths that allow access by means of network cards that identify users"; Fuller's textual injunctions — "turn left, insert card now"). See non-places, interactive-architecture.
• A Christian House (Beecher & Stowe 1869/2006) — the hand-moved register: the rolling screen as boundary-furnishing ("The large room on the left can be made to serve the purpose of several rooms by means of a movable screen," p. 46; "a child can move the whole easily," p. 46) and the sliding-window piazza convertible into a winter greenhouse (p. 44) — thresholds adjusted rather than crossed. See flexible-interior.
• Fabricating interiority (Manack 2018) — the constructional register: architecture's threshold-making ("to construct a threshold that articulates distinctions and relationships between natural and fabricated worlds") answered by the interior's disclosed separation — the envelope that "never touch[es] the surrounding construction, with continuous reveals at the perimeter creating the effect that this element hovers within the space"; "a delamination from it, yet borrow[ing] the logic of the architecture to establish independence and distinctions from it." See fabrication, poche.
• Thick Edge (Borden 1996/2006) — the socio-spatial register: Simmel's "sociological fact that is formed spatially"; the blue screen as "a boundary of exclusion, a brutally frontal relation" engineered through the body ("only 150 millimetres clear in front"); the 'Go-Between Screens' that are "never sealed," controlling instead through the visitor's self-perception ("'Should I be here, and now? Do I have the right of passage?'"); boundaries as "permeable, temporal and political markers of bodily negotiation" (editors, p. 49). See thick-edge, hostile-architecture, privatised-public-space.
• Territory and inhabitation (Campos 2018) — the territorial-portable register: the tapestry as a boundary in transit ("Wherever their owners took them, tapestries marked territory"); Çatalhöyük's roofline as "the territorial marker between interior and exterior – private and public – space"; and the Lockheed camouflage scrim as the decoy boundary — "paper thin fake houses, streets with rubber cars… even laundry lines complete with drying clothes" — designed to be misread rather than crossed. See territory, liberated-interior.
• Inside Looking In: The Prospect of the Aspect (McClure & McClure 2018) — the climatological register: air conditioning's "absolute boundary between inside and outside" as the hermetic seal; the envelope that let "the interior no longer need[ ] to negotiate – or even acknowledge – the exterior"; the boundary as tenure rather than seal ("the clarity of both being within a limited boundary (interior) and simultaneously looking beyond and experiencing that boundary (exterior)"). See hermetic-seal, prospect-of-the-aspect.
• The waiting room (Hedges 2018) — the eighth, etiquette/gender register: "Social roles and conventions have regulated, determined, and produced the interior; etiquettes and excluding boundaries construct and save the waiting interior, a constructed possibility of privacy"; "Some people will not pass through; it is a place for waiting and a peculiar limbo used before or after travel"; "neither fully public nor fully private, an indeterminate character." The boundary as a gendered rule-system that preserves interiority (see waiting-room, gendered-space, liminality).
• Oceanic interiorities (Treadwell 2018) — the ninth, oceanic/navigational register: Hau'ofa's "Boundaries were not imaginary lines in the ocean, but rather points of entry that were constantly negotiated and even contested. The sea was open to anyone who could navigate his way through"; stick charts as "precise spatial descriptions of bodies moving under a rotating sky"; "The sea is porous, map-like, narrated, and figured." See sea-of-islands, oceanic-interiority.
• Thing-Shapes (Dubbeldam 2002/2006) — the tenth, responsive-material register: "boundaries are no longer barriers but are interactive; they are creases – a hard-soft space allowing for local conditions" (p. 96); "The politics of layering, creasing and wrapping activate zones and environments where boundaries are negotiated and distinctions are blurred" (p. 98); the crease as "malleable, soft, adaptable and multidimensional. Not unlike cartilage between spinal cord fragments" (p. 99); and the Aida smart wall that "renegotiates both the urban landscape (hard space) and the private domain (soft space)" with creases as "local insertions" (p. 100). See crease, thing-shapes.
• Transforming Interior Volumes (Anderson & Lovell-Anderson 2018) — the eleventh, mathematical register: Yeung's "ambiguity between invisible and defined boundaries in mathematical surfaces" (2016, p. 12, quoted in Figure 18.3), which "may translate to factors of the component in regards to overall geometry relating to form flexibility"; the system's formal "boundary" as one of its defining characteristics (components, constraints, interrelationships, interface, boundary, purpose, environment, input, output). See the-gyroid, surface-mathematics, systems-theory.
• Sensorial interior landscapes (Garófalo-Khan 2018) — the twelfth, performative/diffused register: SOL Grotto's "interior redefined by the articulation of a performative boundary that presents a 'mediated experience of water, coolness, and light'" — the tube wall as cave wall, waterfall, and cool-air membrane at once, "provided by the Venturi effect, rather than the thermal sink of the moist earth"; and Bienvenidos al Sur's "diffused boundary [that] modulates moisture, light, air, smell, and sound," where "there is no continuous weather or thermal boundary, just a thicket." The boundary as modulation rather than division. See performative-ornament, ambient-conditioning, inside-outside-dialectic.
• Men's Room (Edelman 1996/2006) — the thirteenth, anti-view register: the boundary as arrested visual commerce — the men's room "tends to lack windows," its glass "more often translucent than transparent… generally precludes any visual commerce between the areas without and within," and mirrors replace openings, "satisfying the eye's desire for depth of field by returning its look to itself" (p. 103). Yet "Closed in on itself as if to exemplify the very notion of constructed space," the room is "always… designed to permit exchanges between inside and outside analogous to those that would seem most successfully arrested by its circumscription of the visual" (pp. 103–104) — the boundary that blocks the view while the flows it houses continue. The boundary here is turned inward on its own occupants: translucent glazing and self-reflexive segmentation as a rule-system enforced by the users' own glances. See mens-room, privacy, gaze.
• On technological limits (Olsen 2018) — the fourteenth, tactile register (via Derrida and Deleuze): "To touch is to touch a limit, a surface, a border, an outline" (2005, p. 103) — the tactile quality of "the boundary between architecture proper and the affective experience within it, what Gilles Deleuze refers to as the tactile-optical experience"; "The texture or smoothness of the surfaces, coolness or warmth of materials, and dance of light delineate the emotive and sensorial qualities within a space"; the interior surfaces that "mediate between the private collective (program functions) and the private individual or sensorial experience" (the Aureli analogy). The boundary as the touched, vibrant border that defines the interior condition. See quasi-autonomous-interior, technological-limits.
• Notes on Digital Nesting (Goulthorpe 2002/2006) — the fifteenth, psychoanalytic register: the actuated wall's conceptual warrant. The Aegis Hyposurface's author names the distinction his surface enacts — Ferenczi's autoplastic/alloplastic pair, "the difference between a rigid and static relationship between the environment and the self, an autoplastic rigidity, and a malleable and reciprocal alloplastic deformability" (note 8, p. 137) — with Bachelard's nest as the boundary's natural model: "an intricate imprint of the inhabiting body," an environment "continually recalibrated to suit the vulnerability of our relation to the environment" (p. 135). Where Taylor's register describes what the actuated wall does, Goulthorpe's names what it is for: converting the boundary from a static limit into a reciprocal, deformable relation. See alloplastic-space, interactive-architecture.
• Buildings and their Genotypes (Hillier & Hanson 1984/2006) — the sixteenth, syntactic/social-logical register: the boundary's dual nature — "the dualism reflects only the dual nature of the boundary, which at one and the same time creates a category of space – the interior – and a form of control – the boundary itself" (pp. 150–151); the fact of disconnection — "The same drawing of boundaries that constructs a settlement as a continuous spatial aggregate… creates a set of discontinuous spaces on the insides of those cells… a series of discrete events, expressly and explicitly disconnected from the global system" (p. 149); the reversal effect — "the most localised scale of spatial organisation tends to become the most global in its reference. The boundary refers to the principles of a culture" (p. 150); and the boundary's social administration — visitors who "have a legitimate reason to cross the boundary of a building, but… have no control over that building" (p. 151). See transpatial-solidarity, reversal-effect, inhabitant-and-visitor, gamma-analysis.
• Time travel (Massey 2018) — the seventeenth, ephemeral/temporal register: the boundary as a duration. an Exhibit's Perspex sheets are "temporary structures" and "temporary boundaries erected by Perspex panels" — hung on nylon thread, rehung for each show, "an endless distribution of divisions and boundaries" — the boundary existing only as long as the exhibition that needs it. And the boundary turns temporal-symbolic in Massey's reading of Hamilton's photograph: the translucent sheets "erect[] new boundaries between past and present, then and now – the here and now," so that the ephemeral boundary divides not two spaces but two times — imperial London from "London as the site of modernity" (see populable-art-work, ephemeral-interior).
• Inside-out and outside-in (Vanucci 2018) — the eighteenth, envelopal/agency-bearing register: the envelope "organizes the interior of the building and the external public realm with which it communicates; it controls the internal environment and marks the boundary of an architectural interiority"; "It demarcates the boundaries between two different spheres of control: the private and public properties"; the boundary "engages with its surroundings in many different forms: economically, socially, psychologically, and politically" and "synthesizes many heterogeneous inputs, including economic climate, environment, legislative norms, social organization, etc."; its contemporary form — "The building envelope becomes the field of negotiation between interior spatiality and exterior appearance." Where the McClures' envelope-boundary seals (the hermetic register), Vanucci's negotiates — the boundary as active difference-register (see performative-envelope, hermetic-seal, privacy).
• Event-space: A performance model for spatial design (Hannah 2018) — the nineteenth, typographic-membrane and filter registers: the hyphen as "a necessary membrane holding the fluid from the solid, the dynamic from the static, event from space" — the boundary as punctuation that "simultaneously separates and joins while enacting a break or interruption"; and Massumi's filter thesis displacing boundedness as the boundary's measure: "What is pertinent about an event-space is not its boundedness, but what elements it lets pass, according to what criteria, at what rate, and to what effect" (p. 79) — the boundary as rate-and-criteria regulator rather than container-wall. The register's political face: the boundary whose permeability is a design-politics ("a free-flowing exchange of… bodies, and ideas… made present by spatiality that operates figuratively and concretely as an accessible, porous, and unpredictable realm") against the post-9/11 "curtail[ment of] freedom of movement… in the very name of 'freedom'" — see weak-architecture, spacing, power-and-space.
• Topology and interiority: Folding space inside (Voordouw 2018) — the twentieth, historical-diagnostic register: the boundary's past-century evolution "from a defined threshold to a porous, ambiguous gradient"; Lefebvre's ambiguous continuity ("visible boundaries… give rise for their part to an appearance of separation between spaces where in fact what exists is an ambiguous continuity," p. 87) and Teyssot's porous thresholds (p. 266); the epistemic cost ("Knowing comes from definition; the gradient that is continually blurred is also the zone that prevents knowing") against Leenhardt's knowable threshold ("a zone formed by precise tectonics, an area of knowledge and even of knowability," p. 169); the two failing edge conditions of the topological surface; and the rescue condition — "retain the porosity but rescind the ambiguity." See threshold-to-gradient, topology.
• Home: Territory and Identity (Wise 2000/2006) — the twenty-fifth, minimal/everyday register: "The marker (wall, road, line, border, post, sign) is static, dull, and cold. But when lived (encountered, manipulated, touched, voiced, glanced at, practised) it radiates a milieu, a field of force, a shape of space" (p. 392) — the boundary's lived radiance distinguished from its static mark; and the wall-free marking apparatus: "a coat saves the seat," posture ("legs stretched out, newspaper up"), cigarette smoke and scent, clothing style, t-shirt words, graffiti — "Symbols also mark space." The boundary as milieu-radiator; Ardener's gate-keeping executed by bodies and stuff. See milieu, home, trace.
• Interiors as global constructs (Hadjiyanni 2018) — the twenty-first, geopolitical register: the boundary that moves beneath the still room — interiors' fluid character "changes and evolves in response to fluctuating borders, a multiplicity of identities, and varying layers of sense of belonging"; the mismatch thesis ("What are the implications of 'falling between' for interiors, which are fixed spatialities, bounded by walls, floors, and ceilings?"); Ardener's Immigration Officer gate-keeping a border that has already moved. See global-constructs, bounded-choices, transbodied-space.
• Public spheres: Hong Kong's interior urbanism (Solomon 2018) — the twenty-second, sensory/temporary register: "the sounds and scents of the foreign workers, mostly Filipino, establish temporary cultural boundaries between their 'Little Manila' and the financial center" (Howes, citing Law) — "the politics of differing sensory strategies for making sense of the same place"; the mall's engineered perfume as filter ("prodigious scents" distinguishing Armani from the domestic-workers' mall); and Cities Without Ground's boundary claim — "Boundaries determined by sound or smell (a street of flower vendors or bird keepers, or an artificially perfumed mall) can ultimately provide more substantive spatial boundaries than a ground" (via the ORO synopsis). The boundary as sensory perimeter — established by nose and ear, temporary, and both partitioning and constituting a public (see smellscape, heterosmia, atmospheric-politics, public-sphere).
• Why this, why now? The case for interior architecture (Marinic 2018) — the twenty-third, disciplinary register: interior architecture's discourse "breaking down boundaries and distinctions between the historically siloed – and generally contentious – territories of architecture and interior design. This blurring, in turn, has restructured how we work and how design services are delivered, as well as how designers, clients, and fabricators collaborate"; the boundary-work named as "the mining of an interstitial zone between architecture and interior design"; and the boundary's defenders named — the conservative skepticism, the "otherness" lens, and the rejection of "the binding potentialities which interior architecture offers to their shared, building-oriented field." See disciplinary-frontiers, identity-of-the-interior.
• Inside Fear: Secret Places and Hidden Spaces in Dwellings (Troutman 1997/2006) — the twenty-fourth, psychic register: the boundary as the psyche's address within the house — "Wishes, dreams, fantasies, fears, desires are the inhabitants of the internal boundaries of our everyday environment: the place of the other, the imagined, the double, the dream" (p. 357). Where Ardener's boundaries are rules crossed, Borden's edges negotiated, and Marinic's dissolved between disciplines, Troutman's are inhabited — the house's internal boundaries (hall, closet, cabinet, the hollow wall) as the rooms where the self's unassimilated contents live, the boundary-line thickened into habitable psychic space. See hidden-spaces, interiority, the-double.
• source-notes/dovey-2010-becoming-places
• source-notes/gattegno-johnson-2018-ambient-environments-sentient-spaces

Open Questions

• If a boundary is a rule rather than a wall, can it be represented architecturally at all — what does a gate-keeper look like in a plan drawing?
• The gate-keeper's list (hall porter, usherette, Immigration Officer) spans scales from building to state — is the interior's threshold (the door, the vestibule, the cloakroom) the scale at which boundary rules become visible enough to design?
• Topological space preserves identity across boundary alteration — what, for a building, counts as its "conceptual slot" such that alterations do not change what it is (cf. the adaptive-reuse question of adaptive-reuse)?
• When the gate-keeper becomes a sensor network (the non-place's card readers and directional paths), does the boundary rule-system become more total (continuous identification) or more fragile (disruption, hacking, failure)? Ardener's rules were legible to those they governed — are algorithmic boundaries?
• If a wall can be an actuated surface that "question[s] the seeming solidity" of its own matter (Aegis), is the boundary's essence still separation — or has it become a display, an event in time rather than a line in space?
• Borden's two cases calibrate the socio-spatial register's extremes: exclusion computed from the body (the 45° deviation's "150 millimetres clear") and control without physical exclusion (the 2-metre gap that is "never sealed"). Is there a continuum between them — and what parameter, other than the body's thickness, could make the self-questioning gate legible in a drawing?
• Hau'ofa's sea boundary is a negotiated point of entry in an open medium — Ardener's rule-system with the rules negotiated per crossing. Does the oceanic register refute the line-model of the boundary altogether, and can architectural boundaries (thresholds, gates, screens) be designed as points of entry rather than perimeters — the boundary as negotiated crossing rather than fixed line?
• Yeung's "ambiguity between invisible and defined boundaries in mathematical surfaces" (via Anderson & Lovell-Anderson) locates the boundary's failure in the computation itself: a surface that cannot declare whether it encloses. Is this ambiguity a representational defect (fixable by better geometry) or the boundary's first genuinely ontological undecidability — and does an interior volume that may not enclose anything still count as an interior (cf. the interior-architecture eighteenth register)?
• Solomon/Howes/Law's sensory boundary is "temporary" — redrawn weekly by the day off and dissolved at its end. Is temporariness the sensory register's weakness (no stable rule) or its politics (a boundary that can be redrawn without a court)? And is the mall's engineered perfume the same kind of boundary (an olfactory enclosure) — can boundary-design be fought with counter-boundary-design (smellscape, atmospheric-politics)?
• Hillier and Hanson claim every boundary "creates a category of space… and a form of control" simultaneously — can the two halves be designed independently (a category without control, an open interior that still refers to the culture's principles), or does the reversal effect (reversal-effect) require the full dual structure? And if "the boundary refers to the principles of a culture," whose principles does the boundary of a corporate franchise interior refer to — the culture's or the franchise's?
• Voordouw's gradient register adds a historical axis the page's other registers lack: the boundary itself has evolved ("from a defined threshold to a porous, ambiguous gradient"). If he is right that "Knowing comes from definition; the gradient… is also the zone that prevents knowing," then the wiki's gradient-adjacent registers (the diffused boundary, the crease, the filter) face an epistemic question they have not answered: can a boundary modulate, negotiate, or filter and remain knowable — or does knowability require exactly the tectonic definition ("an 'interval between things'") that porosity erodes? Is the rescue ("retain the porosity but rescind the ambiguity") geometrically, legally, and socially possible at once?