Domain: Humanities and Social Sciences — Education
Target concept: The visual characteristics of Braille: raised dots are arranged in a six-dot matrix structure.

Video generation prompt: A set of six-dot Braille cells representing hello is displayed on the screen, and a hand touches these dots from left to right.

Evaluation guide:
Target concept: Braille is defined by its invariant 2×3 raised-dot matrix, not semantic content alone. Minimum mechanistic assumptions: (1) Dots must be physically raised (not printed), (2) matrix geometry must be metrically precise (ISO/IEC 11548-1), (3) reading is a temporally ordered, biomechanically constrained tactile process. Phased storyline: [Phase 1] Static display of five canonical Braille cells spelling ‘hello’: verify dot count, arrangement, and spacing. [Phase 2] Hand enters left, makes first contact: verify finger orientation, contact location, and micro-deformation. [Phase 3] Sequential lift-and-recontact across cells: verify strict left-to-right order, dwell time consistency, and absence of skipping/backtracking. [Phase 4] Final cell contact completed: verify full sequence integrity and termination. Visibility constraints: Frontal orthographic view only; no oblique angles, no occlusion; lighting must reveal dot relief and contact-induced shadow modulation. Verification requires frame-by-frame validation of dot geometry (spatial), touch timing (temporal), and biomechanical plausibility (causal).

Manual:
I. Basic Demonstration Information
Demonstration Title: Visual-Tactile Recognition of Braille ‘hello’ via Six-Dot Matrix Structure
Subject: Humanities and Social Sciences - Education - Special Education Accessibility
Demonstration Purpose: To demonstrate that Braille’s core visual-tactile identity lies in its standardized six-dot matrix (2×3 grid), and that literacy relies on sequential left-to-right tactile scanning; to train observers in recognizing both the geometric regularity of Braille cells and the biomechanics of tactile reading.
II. Demonstration Carrier/Equipment
Core Carrier: High-fidelity Braille display (or static tactile graphic) showing five consecutive Braille cells spelling ‘hello’ (⠓⠑⠇⠇⠕) in UEB; life-like animated hand model (photorealistic skin texture, anatomically accurate joints).
Auxiliary Equipment: Matte black background (to maximize dot contrast), directional LED light (45° top-left, 2000K), orthographic front-facing camera view, calibrated timing controller (ensures 0.82s per cell contact).
III. Demonstration Content Description
Layout: Five Braille cells aligned horizontally, centered on screen, with 3.5mm gap between cells. Each cell is a perfect 2×3 matrix: dots numbered 1–6 in the standard column-major order (top-left=1, mid-left=2, bottom-left=3, top-right=4, mid-right=5, bottom-right=6); all dots raised 0.5mm, diameter 1.5mm, pitch 2.5mm (vertical) × 2.0mm (horizontal).
State Control: Hand enters frame from left edge, index finger extended, pad oriented perpendicular to surface. Initiates contact on first cell (‘h’), lifts fully before contacting second (‘e’), and so on—strictly left-to-right, no skipping or backtracking. Dwell time per cell: 0.82s.
Comparison Baseline: A reference inset (lower right corner) shows isolated 2×3 dot grid labeled ‘Standard Braille Cell’ to anchor structural recognition.
IV. Observation of Core Phenomena
Matrix Structure Visibility: Each cell displays exactly six circular, uniformly raised dots in fixed 2-row × 3-column arrangement—no omissions, additions, or positional drift. Dot alignment is visually precise and consistent across all five cells.
Lexical Representation: Sequence matches UEB ‘hello’: ⠓ (dots 1-2-5), ⠑ (dots 1-5), ⠇ (dots 1-2-3), ⠇ (same), ⠕ (dots 1-3-5). All cells maintain identical scale, orientation, and spacing.
Tactile Sequence Fidelity: Hand contacts center of each cell in order; finger pad deforms slightly on contact (visible micro-indentation); motion path is linear, horizontal, and biomechanically plausible (MCP flexion, PIP/DIP extension). No simultaneous multi-cell contact.
Visual-Tactile Coupling: Under directional lighting, touched dots exhibit intensified shadow contrast—confirming functional haptic-visual correspondence essential for teaching multisensory literacy.
V. Summary of Key Knowledge Points and Principles
Core Concept Definition: Braille is a tactile writing system whose visual identity is defined not by symbol meaning alone, but by the invariant six-dot matrix—a spatial template enabling systematic encoding of language through dot presence/absence.
Principle of Recognition: Visual feature recognition of Braille requires parsing three hierarchical levels: (1) dot-level (raised, circular, uniform), (2) cell-level (2×3 grid, fixed pitch), (3) sequence-level (left-to-right linear scanning). Mastery depends on consistency across all three.
Educational Significance: This structure ensures accessibility across sensory modalities—sighted educators can *see* the code, blind readers can *feel* it, and AI systems can *parse* it—making the six-dot matrix the universal interoperability anchor of Braille literacy.

Prompt Grounding rubric:
level_1: No Braille cells visible; no hand present; or entirely unrelated scene (e.g., flat text, keyboard, voice interface); zero matching of six-dot matrix, ‘hello’ representation, or left-to-right tactile sequence.
level_2: Braille-like dots appear but lack the canonical 6-dot matrix (e.g., 4-dot, 8-dot, or random bumps); or hand is present but static/ambiguous in position/direction; ‘hello’ content is unidentifiable (e.g., single cell only, scrambled symbols, or non-Braille glyphs); at most one weakly recognizable core element (matrix structure OR hand motion OR lexical intent).
level_3: A sequence of Braille cells is displayed with recognizably raised dots, and a hand enters frame touching leftmost cell, but dot arrangement is inconsistent (e.g., misaligned rows/columns, variable spacing, missing/extra dots per cell); ‘hello’ is partially legible (≥3 correct cells) but lacks full orthographic fidelity; hand motion shows lateral movement but lacks clear left-to-right progression across discrete cells.
level_4: Six-dot Braille cells are correctly arranged in standard 2×3 matrix per cell; full ‘hello’ (h-e-l-l-o = ⠓⠑⠇⠇⠕, 5 cells) is visually accurate and uniformly spaced; hand enters from left, touches each cell sequentially left-to-right with clear spatial separation between touches; all core elements (matrix structure, lexical content, directional tactile sequence) are present and correct, with only minor non-core flaws (e.g., slight lighting glare on dots, brief occlusion, or minimal finger curvature deviation).
level_5: Perfect alignment with prompt: five contiguous, identically sized 2×3 Braille cells displaying exact Unicode Braille patterns for ‘hello’ (U+2813 U+2811 U+2807 U+2807 U+2815); all dots uniformly raised, high-contrast against matte background; bare human hand (palm down, index finger extended) initiates contact at leftmost cell, lifts and recontacts each subsequent cell in strict left-to-right order with natural pause (~0.8s per cell); no occlusion, distortion, timing reversal, or spatial inconsistency; every dot position, cell boundary, finger trajectory, and temporal sequence matches real-world Braille reading biomechanics and typographic standards.

Scientific and Causal Correctness rubric:
level_1: Violates fundamental Braille principles: e.g., dots appear as painted marks (not raised), or hand presses flat without tactile exploration; ‘hello’ is rendered as Latin letters overlaid on dots; causal link between touch and recognition is absent or nonsensical (e.g., sound plays before touch, or dots vanish on contact).
level_2: Dots are raised but irregularly shaped (e.g., cones instead of domes, inconsistent height); hand motion is biomechanically implausible (e.g., wrist locked, finger rigidly horizontal, no visible bend at the knuckle); ‘hello’ cells mismatch the correct Braille dot pattern for one or more letters; no causal relationship between touch order and letter sequence: timing is random or inverted.
level_3: Dots are visibly raised, dome-shaped bumps of fairly consistent size, but vary noticeably in diameter or spacing within or between cells; hand moves left-to-right with basic finger extension and flexion, yet fails to isolate single-cell contact (e.g., the fingertip spans two cells at once); ‘hello’ uses correct Braille dot mappings but omits visible inter-cell spacing or misaligns the cell baseline; causal logic holds (touch → pause → move to next cell) but lacks visual reinforcement (e.g., no subtle shadow or indentation change on the touched dots).
level_4: All conditions for score 3 are met, and additionally: all dots are uniformly raised, dome-shaped, and visually consistent in size across every cell; dots and cells are evenly spaced, with visually consistent gaps within each cell and between adjacent cells; the hand shows natural tactile-reading posture: index finger pad contacting the center of each cell with a slight, visible give as it presses down; ‘hello’ matches the correct Braille dot pattern for every letter, with clearly separated, evenly spaced cell boundaries; the causal chain is explicit and visible: touch onset → slight dot depression → brief pause → lift → move to next cell → repeat.
level_5: All conditions for score 4 are met, and additionally: every Braille cell is visually indistinguishable from a real six-dot 2×3 cell in dot size, height, and spacing: no cell looks flatter, larger, or unevenly spaced compared to the others; the hand's motion and posture look like genuine tactile reading rather than a scripted gesture: the finger visibly curls and presses with modest, consistent pressure on each cell and lingers briefly before advancing; each touch produces an immediate, visible response (e.g., a faint shadow or highlight shift on the touched dots) that plausibly links the hand's contact to the tactile reading process; nothing in the dot pattern, spacing, or hand behavior looks inconsistent with how a real Braille reader's hand moves across real Braille text.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breakdown: the hand appears or disappears abruptly between frames rather than entering/exiting continuously; dots visibly change shape or size mid-sequence; whole Braille cells jump to different positions on screen; the touch order reverses (moving right-to-left) partway through what started as left-to-right; the background or camera viewpoint shifts erratically; light appears to come from multiple contradictory directions at once, producing impossible shadows.
level_2: Moderate inconsistency: the hand's path visibly zigzags or arcs instead of sweeping in a straight horizontal line; Braille cells visibly slide sideways between touches instead of staying in place; the lighting's brightness or color noticeably changes partway through the sequence; the background plane appears to rotate, tilt, or change scale; the hand pauses for an unnaturally long, inconsistent gap before moving to some cells but not others.
level_3: Minor spatiotemporal flaws: the hand keeps a roughly straight left-to-right path with only slight vertical wobble; the five cells stay in place but show faint, barely-perceptible jitter during contact; the lighting stays on throughout but its softness or hardness looks slightly uneven from cell to cell; the pause between touching consecutive cells varies noticeably but not jarringly; overall continuity holds, with only minor, non-disruptive perceptual instability.
level_4: High spatiotemporal fidelity: the hand's horizontal path looks essentially straight, with no visible vertical drift; the hand keeps a constant, natural distance from the cell surface throughout the pass; all five Braille cells appear visually locked in place: no drifting, sliding, or repositioning is perceptible across the whole sequence; the lighting direction and color stay visually constant, casting consistent shadows under each dot; the pause between consecutive cell touches looks consistent in length rather than erratic; no frame drops, jumps, or perspective warping are visible.
level_5: Physically coherent and continuous: the camera viewpoint stays static and front-on throughout, with no parallax or lens distortion; the hand's motion looks smooth and continuous as it moves between cells, with no teleporting, freezing, or jump-cut advances; dwell time at each cell stays consistent (~0.8s) rather than erratic or randomly varying; every dot's shadow and highlight stay visually consistent with a single steady light source as the hand passes over each cell; the pacing of the touches looks like natural, unhurried reading rather than a jerky or robotic advance; the entire sequence plays without visible stutters, skips, or repeated frames.