Architectural Analysis: Threshold, Sequence, and Hierarchy

Analytical Framework for Architectural Precedents

  • Architectural analysis builds upon orthographic drawing (plans, sections, elevations, and three-dimensional representations) to perform a deeper analytical investigation into precedent projects.
  • Analytical statements utilize core architectural vocabulary and design tools, relying heavily on diagramming techniques developed in studio coursework.
  • Three fundamental design principles serve as the minimum required baseline for formulating an analytical statement:
    • Threshold
    • Sequence
    • Hierarchy

Architectural Thresholds

  • Definition of Threshold:
    • A marked moment of transition from one space to another.
    • Represents a distinct change in spatial experience and the revelation of something new.
    • Always contains physical or spatial evidence that demarcates or signals the transition.
  • Spatial Demarcations:
    • Clear Edge Condition: A sharp, distinct demarcation such as a physical line, ceiling marking, floor marking, or explicit boundary plane.
    • Gradual Zone of Transition: A volumetric or temporal zone through which a user moves rather than crossing a single thin line.

Typologies of Thresholds

  • Planar Threshold:
    • Defined by passing through a two-dimensional boundary plane into a new spatial condition.
    • Functions as a distinct linear or planar demarcation separating two distinct spatial realms.
  • Volumetric Threshold:
    • Defined by moving between spaces possessing distinctly different spatial or volumetric conditions.
    • Differentiated through spatial mechanisms such as:
    • Elevation changes (floor level shifts).
    • Volumetric compression and expansion.
    • Overhead conditions (e.g., deep extended eaves, lowered ceilings, or altered overhead structural canopies separating interior and exterior spaces).
  • Material Threshold:
    • Defined by changes in material properties that establish clear spatial differentiation.
    • Applies not only to transitioning between different materials (e.g., concrete to wood) but also to changing the surface properties, treatments, installation patterns, or textures within the same material.
  • Phenomenal Threshold:
    • Defined as an experiential change that may or may not result directly from tangible architectural hardware or technological interventions.
    • Operates through indirect sensory agents:
    • Light: Solid/void conditions that use light and shadow patterns as active architectural agents to mark transition zones.
    • Temperature: Experiential shifts between distinct microclimates (e.g., transitioning from a warm exterior to a frigid interior zone).
    • Sound: Acoustic transitions between reverberant and sound-damped spatial environments.
    • Smell: Olfactory gradients used to delineate spatial zones.

Case Studies and Precedents of Thresholds

  • Bols Museum (Amsterdam):
    • Utilizes smell as a primary phenomenal threshold to delineate different zones within the building.
    • Distinct olfactory profiles (nutty, fruity, weedy, and barny/distilling smells) signal movement into different functional areas.
    • Spatial mechanics: Identically structured rooms are connected by standard 3 ft3\,\text{ft} doorway openings (planar thresholds), where olfactory gradients lead visitors progressively from one distinct smell zone into the next.
  • Art House (LTL Architects / Lewis and Martin Lewis):
    • Planar Threshold: Entry from the public street into the building via a glass entry vestibule.
    • Volumetric Threshold: An extended overhead roof eave stretches out over the sidewalk, capturing overhead space to establish a covered volumetric entry zone prior to crossing the physical envelope.
    • Zonal Threshold: Vertical circulation through the glass enclosure guides users upward through the programmatic layout.
    • Graphic Integration: Architectural text ("Art House") on the facade splits across the exterior and interior glass surfaces; viewed head-on from the street it reads clearly, but stepping underneath breaks the text up and physically pulls visitors through the glass threshold.
    • Circulation Feature: A grand timber/wood staircase features vertical louvers pulling visitors up toward 2nd-floor exhibition spaces. The last riser of the wood stair extends continuously to form the top surface of the reception/lobby desk.
  • Space to Space (Timber and Masonry Precedent):
    • Combines volumetric and material thresholds using timber lining, poured concrete/cement, and ceramic or brick masonry along the floor level that continues upward to establish a structural base.
  • Sunken Landscape Precedent:
    • Merges material surface, volumetric, and zonal thresholds by guiding movement down from an open landscape into a recessed interior condition defined by overlapping wall planes.
  • Tadao Ando Precedent:
    • Interconnects material and phenomenal thresholds using poured-in-place concrete walls, attached timber flooring, and dramatic natural light penetration that acts as a phenomenal spatial agent.
  • L-Shaped Bracket Precedent:
    • Demonstrates phenomenal and planar thresholds where large L-shaped structural brackets form physical plane separations, creating distinct spatial experiences inside versus outside the brackets.
  • Additive Bridge Structure:
    • Incorporates planar, zonal, and elevation thresholds. Uses an additive entry wall, a structural roof plate providing vertical enclosure, elevation changes in the floor plate, and an additive bridge acting as a spatial collector.
  • Pillar/Column Assembly:
    • Demonstrates planar, volumetric, and material thresholds through a dense additive assembly of vertical columns/pillars, contrasting an open exterior environment with a compressed, dense interior structural field.

Architectural Sequence and Spatial Organization

  • Definition of Sequence:
    • The deliberate, ordered arrangement of related spaces, movements, and spatial experiences following one another.
    • Operates to establish spatial variation (e.g., transitioning from a large space to a smaller space, then to an elongated corridor, followed by a vaulted hall).
    • Distinct from "situation" and "circulation".

Sequence vs. Circulation

  • Circulation: Purely functional movement from point A to point B without emphasis on spatial experience (e.g., taking an elevator straight from the ground level to a target destination).
  • Sequence: A choreographed, experiential journey through a progression of distinct spaces (e.g., entering a lobby, taking a first flight of stairs to a 2nd-floor gallery, circulating through site model exhibits, ascending to 6th-floor critique spaces, and arriving at the design studio).

Typologies of Spatial Organization

Spatial organizations categorize the relationships between groupings of forms and spaces, derived from principles in Francis D. K. Ching's Architecture: Form, Space, and Order.

  • Linear Organization:
    • A series of repetitive spaces arranged sequentially along a continuous line.
    • The defining axis does not need to be a straight line; it can follow curved, segmented, or zigzag paths.
    • Example 1 (MIT Building): A linear sequence of repeating room modules and window bays arranged along an angular, curved exterior envelope.
    • Example 2 (Metro Station): A linear sequence formed by a repeating series of structural arches along an implied path.
  • Radial Organization:
    • Consists of a central focal point or collective space from which linear spatial organizations (arms/spokes) extend outward.
    • Key Distinctions:
    • Radial organization is distinct from simple centralized organization.
    • Access and continuous circulation to the extending linear arms must emanate directly from or pass through the central focal point.
    • Metaphor: A bicycle wheel hub and spokes.
    • Example: A central collective gathering hub featuring 33 distinct linear programmatic arms radiating outward.
  • Gridded Organization:
    • Spaces organized and regulated within a three-dimensional structural or spatial grid network.
    • Consists of modular forms related by uniform dimensional parameters.
    • Offers design flexibility, allowing spaces to rotate, scale (e.g., double-size or half-size modules), or step in and out while maintaining strict reference to the underlying grid framework.
    • Example (Mosque of Tin Mal, Morocco): A structural grid regulating repeating modular cube units.
  • Clustered Organization:
    • Spaces grouped together based on physical proximity, sharing common visual traits, structural modules, or spatial relationships.
    • Consists of a flexible network configuration connecting established points or collections of non-identical shapes.
    • Example (Habitat 67): Micro-collections of modular box units interconnected across an overall complex structure.
  • Procession:
    • A highly choreographed architectural experience guiding user movement through a purposefully ordered sequence of spaces.

Principles and Typologies of Hierarchy

  • Definition of Hierarchy:
    • The undeniable importance, dominance, or visual influence of an architectural element or space within a composition.
    • A system organizing spatial components based on relative significance, ensuring key programmatic or structural zones are visually obvious.

Typologies of Hierarchy

  • Hierarchy by Shape:
    • Achieved when an architectural element possesses a geometry noticeably different from surrounding elements (e.g., a circle, cone, or rotated polygon placed within a field of uniform rectangular grids).
  • Hierarchy by Size (Scale):
    • Established by significantly altering the scale or volume of an element relative to its context (e.g., an exceptionally massive structural element or an imposing civic volume that cannot be ignored).
    • Terminology Note: In structural terminology, a main primary beam carrying secondary beams is designated as a girder.
    • Example (SVR Project): Massive scale and infrastructural presence within a surrounding roundabout context.
  • Hierarchy by Material:
    • Established through stark material contrasts (e.g., dense, heavy stereotomic masonry/concrete versus lightweight transparent glass; contrasting surface textures or introducing natural elements like water into a built composition).
  • Hierarchy by Location:
    • Established through strategic spatial placement, such as central positioning, elevation above a plane, or isolating an element completely from a main cluster/field.

Case Studies in Spatial Hierarchy

  • Size Hierarchy Example (SVR Project Roundabout):
    • Uses monumental scale to command spatial attention; impossible to ignore due to sheer physical presence.
  • Stereotomic Heavy Material Precedent:
    • Demonstrates material hierarchy using heavy stone/masonry arches and solid construction techniques contrasted against light structural elements.
  • Location Hierarchy Precedent:
    • Demonstrates hierarchy by pulling a specific volumetric unit out from a main building mass and elevating it into an isolated position.
  • Le Corbusier Facade Precedent:
    • Integrates location and material hierarchy within a dense architectural context to distinguish primary office/programmatic spaces from adjacent surrounding structures.

Dialogue and Discussion

  • Olfactory Threshold Details (Bols Museum, Amsterdam):
    • Maya highlighted the Bols Museum in Amsterdam, noting how distinct smells (nutty, fruity, weedy, and distilling/barny aromas) function as thresholds guiding visitors between rooms.
    • Rooms are uniform in dimension, connected by standard 3 ft3\,\text{ft} doorways; smell gradients start near the door openings to pull visitors into subsequent spaces.
  • Structural Terminology Context:
    • A participant noted structural terminology taught by Jill, defining a girder as a primary large-scale beam supporting structural loads.
  • Interactive Visual Analysis:
    • Inquiries regarding shape and location hierarchy were analyzed by workshop participants including Tennyson, Ben, Stephanie, Nate, Dalia, and Paul.