Spatial Perception & Navigation

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Abstractions about how people and systems represent and navigate spatial layout, including neural and perceptual spatial maps (retinotopy, somatotopy, depth perception), navigation and wayfinding in environments and interfaces (wayfinding system, orientation loss, imageability), and interface metaphors for spatial organization (desktop metaphor, virtual desktop, responsive-layout breakage).

21 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Depth Perception — Recover egocentric distance, depth order, and three-dimensional scene layout from two-dimensional retinal projections by exploiting binocular disparity, motion, occlusion, perspective, texture, oculomotor state, and their reliability-sensitive combination.
• Desktop Metaphor — A graphical-interface conceptual model that maps files, folders, documents, tools, windows, and disposal onto familiar office-desktop objects so users can predict digital actions by analogy.
• Discoverability — Measure the degree to which a system's actions and features can be located through perception and exploration alone — a property of the artifact, not the user — separating capability from findable capability and locating unfound features as a design defect.
• Exploded-view drawing — A drawing that spatially separates components while preserving their assembly order and relationships.
• Imageability — Kevin Lynch's property of a physical environment that lets inhabitants build a vivid, navigable mental map of it, decomposed into five element classes — paths, edges, districts, nodes, landmarks — plus the integration that binds them into one coherent image.
• Information-Scent Failure — Diagnose a navigation failure as the surface cues a user reads before clicking — link text, labels, snippets — failing to predict the destination's content, so the user invests a click on a wrong prediction and backtracks, hunts, or abandons.
• Lead room — Lead room is the compositional space left in front of a subject's facing or motion direction to preserve visual expectation and balance.
• Map Matching — A geospatial inference method that aligns uncertain movement observations with plausible connected positions and paths in a represented travel network.
• Navon Figure — A Navon figure is a recognizable large form made of recognizable smaller forms, used to separate global from local visual processing.
• Orientation Loss — Diagnose why a competent user gets lost by checking three location facts — where am I, what can I move to, how did I arrive — at each transition seam, reading the orientation state off the count of missing facts regardless of substrate.
• Predictive Remapping — Explain trans-saccadic visual stability by having visuospatial neurons shift their receptive fields to a stimulus's future post-saccadic retinal position before the eyes move — driven by an efference copy of the saccade command, so the eyes land on an already-built representation.
• Pulse-Coupled Neural Network — Couple thresholded pulse-generating units so external input and neighboring firings jointly shape temporal signals.
• Responsive-Layout Breakage — Diagnose the silent UI failure where an interface's content survives a viewport, device, or locale transformation but its layout-encoded meaning — priority, adjacency, hierarchy, above-the-fold prominence — is lost, so a passing content-accessibility check actively conceals the defect.
• Retinotopy — Preserve the two-dimensional layout of the visual field as a two-dimensional layout on visual cortex — adjacent points in the world projecting to adjacent neurons — an invertible map that lets a lesion predict a scotoma and a rotating stimulus reconstruct the map.
• Somatotopy — Represent the body surface on neural tissue as a continuous neighbourhood-preserving map — adjacent body regions projecting to adjacent neural loci — with magnification set by receptor density and behavioural importance rather than body size, and reshaped by an activity-dependent plasticity rule.
• Spatial Updating — Keep the surrounding layout accurate as you move by integrating self-motion signals into an estimate of how your viewpoint has changed and applying that transformation to every stored object location, no fresh look required.
• Thatcher Effect — A face with locally inverted eyes and mouth looks grotesque upright but unremarkable upside down, because the holistic configural system that reads inter-feature relations fires only near canonical upright orientation — a switch that lets the effect probe whether that system is engaged and intact.
• Vector Graphics — Images are specified as coordinate-defined geometric objects that can be edited and rendered for different output conditions, rather than as one fixed pixel grid.
• Virtual Desktop — Expand a graphical workspace beyond one physical screen by retaining windows in multiple switchable contexts or in a larger logical surface and exposing only the selected viewport at a time.
• Wayfinding System — A designed network of environmental cues on a legible substrate that lets a goal-directed agent localise, choose a next step, and recover from disorientation — pushing navigation work out of the head into the environment.
• Zooming User Interface — A zooming user interface navigates spatially arranged information by changing viewport scale and position between overview and detail.