Domain: Healthcare — Anthropotomy
Target concept: Composition and Arrangement of the Bones of the Hand

Video generation prompt: A set of adult hand bones is placed on the table for observation of the number, morphology, and arrangement pattern of the carpal bones, metacarpal bones, and phalanges.

Evaluation guide:
(i) Target concept: Static, anatomically accurate external arrangement of adult human hand bones for morphological and spatial learning.
Minimum mechanism: Bones must be dry, intact, isolated skeletal elements (no ligaments, cartilage, or soft tissue); table provides inert, planar, neutral reference plane; viewpoint is fixed and orthogonal to enable unambiguous identification of count, shape, and adjacency.
(ii)Storyline: [Frame 0] Table surface enters view, empty and neutral. [Frame 1–3] All 27 bones enter field simultaneously (no assembly motion) and settle into fixed positions: carpals cluster proximally in concave arc; metacarpals align distally in parallel, diverging slightly for thumb; phalanges extend distally per digit, linearly aligned with no overlap. [Frame 4–10] Zero motion: bones remain perfectly still, fully visible, with consistent lighting and occlusion hierarchy (carpals never occluded by metacarpals, metacarpals never occluded by phalanges); viewer maintains frontal, slightly elevated perspective ensuring full visibility of all bone shapes and inter-group spacing.

Manual:
Experimental Procedure
1. Place a complete set of dried adult human hand bones (8 carpals, 5 metacarpals, 14 phalanges) on a plain, neutral-colored table surface.
2. Arrange them anatomically: carpals clustered proximally, metacarpals aligned distally in parallel rows, phalanges extending distally per digit in correct order (thumb to little finger).
3. Maintain static, top-down/frontal view for observation.
Observation of Experimental Phenomena
- Eight distinct, irregularly shaped carpal bones grouped tightly in proximal row.
- Five elongated, cylindrical metacarpal bones aligned distally to carpals, parallel and spaced evenly.
- Fourteen phalanges: two for thumb (shorter, thicker), three each for index–little fingers (progressively shorter distally), aligned linearly per digit.
Summary of Experimental Principles
Carpal bones (scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate) form proximal wrist unit; metacarpals (I–V) form palm; phalanges (proximal/middle/distal per finger, proximal/distal for thumb) form digits—arranged to demonstrate skeletal architecture of hand.

Prompt Grounding rubric:
level_1: No adult hand bones visible; or only non-bone objects (e.g., plastic model, cartoon image, text overlay) present; or no table surface visible; or carpal/metacarpal/phalanges not simultaneously present as discrete bone units.
level_2: At least one bone type (carpal, metacarpal, or phalange) is present, but at least two types are missing or fused/indistinguishable; or bones are placed on non-table surface (e.g., hand, cloth, floor); or bones are overlaid with labels, arrows, or animations obscuring natural morphology.
level_3: All three bone groups (carpal bones, metacarpal bones, and phalanges) are present as separate, intact, anatomically plausible bone units on a flat table surface; however, at least one group is mislabeled in form (e.g., metacarpals shown as curved like phalanges), or spatial arrangement violates standard anatomical orientation (e.g., phalanges oriented radially instead of distally).
level_4: All three bone groups are present as separate, intact, anatomically plausible bone units on a flat table surface, arranged in correct relative positions: carpal bones proximal and clustered, metacarpals aligned distally in parallel rows, phalanges extending distally from metacarpal heads in proper digit order (thumb to little finger); no labeling, overlays, or motion that disrupts static observation; but minor non-core flaw exists (e.g., one phalanx slightly rotated, or faint shadow distortion affecting one bone edge).
level_5: All three bone groups are present as separate, intact, anatomically plausible bone units on a flat table surface, arranged in correct relative positions and orientations: carpal bones form a compact proximal cluster of 8 distinct bones (scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate); metacarpals are five distinct, parallel, straight rods aligned distally to the carpal cluster; phalanges are 14 distinct segments (2 for the thumb, 3 each for the other four fingers), aligned linearly per digit, extending distally without overlap, rotation, or fusion; zero overlays, zero motion, zero lighting artifacts, zero structural ambiguity.

Scientific and Causal Correctness rubric:
level_1: At least one bone group looks biologically impossible for dried bone: e.g., soft, bendable, translucent, or fleshy/gelatinous surface, or the carpals fused into one solid blob instead of separate bones; or two or more of the three group counts are wrong (e.g., not 8 carpals AND not 14 phalanges).
level_2: All bones look like solid, rigid, dried bone (no impossible material); but exactly one of the three group counts is wrong (e.g., 7 carpals with correct metacarpal and phalanx counts, or 12 phalanges with correct carpal and metacarpal counts); or all three counts are correct but the bones show a non-osseous surface quality (visible fleshy tint, rubbery curvature, or a pore pattern unlike cortical bone).
level_3: All three counts are correct (8 carpals, 5 metacarpals, 14 phalanges) and every bone reads as solid, rigid, dried bone with no impossible material or texture; but at least one shape mismatch persists: e.g., a metacarpal drawn with rounded, phalanx-like joint ends instead of a properly flared distal head, or a phalanx shown straight-sided with no visible joint taper.
level_4: All three counts are correct; every bone reads as solid dried bone with plausible macro-shape (carpals irregular polyhedral blocks, metacarpals cylindrical shafts with a rounded head and flared base, phalanges tapered mini-cylinders with trochlear ends); no bone is fused to or growing out of another; but one non-core morphological deviation remains: e.g., the pisiform is oversized yet still identifiable, or one phalanx lacks a clear trochlear notch while still reading as a distinct segment.
level_5: All three counts are correct (8 carpals, 5 metacarpals, 14 phalanges); every bone shows fully accurate macro-morphology for dried adult bone: smooth ivory-white cortical surface, no cartilage caps, no exposed spongy bone, correctly flared metacarpal heads and bases, and correctly tapered phalangeal shafts with trochlear ends; phalanx length peaks at the middle digit and tapers toward the little finger, consistent with the middle finger being the longest digit of the hand; zero morphological or numerical inaccuracy.

Spatiotemporal Consistency rubric:
level_1: Bones jump between positions from one frame to the next with no visible path connecting the two spots (e.g., a metacarpal is at the left edge of the table in one frame and centered in the next with no in-between motion); or the table's color, texture, or camera angle changes abruptly between frames; or a cast shadow disappears in one frame and reappears pointing a different way in the next; or a bone appears visibly broken in half in one frame and whole again in the next.
level_2: At least one bone shifts by more than half its own length between frames without a visible motion trail; or the front-to-back layering of bones swaps inconsistently (e.g., a phalanx sits behind its metacarpal in one frame and in front of it in the next); or cast shadows point in different directions across frames despite no camera or light movement; or bone outlines flicker or shimmer frame to frame.
level_3: Every carpal, metacarpal, and phalanx keeps the same position and layering relative to the table and to each other for the whole clip, with no jump, no breakage, and no abrupt lighting change; but one minor flaw remains: e.g., a single cast shadow's darkness subtly pulses without any light source moving, or the background behind the bones shows faint jitter.
level_4: All 27 bones stay completely still relative to the table and to one another for the entire clip; cast shadows keep the same direction and shape throughout; the table surface stays continuous with no visible seams or breaks; there is no background drift and no flicker along any bone edge; but one non-core artifact remains: e.g., a uniform faint grain visible across every frame, or a slight overall softness/sharpness shift that does not blur any bone boundary.
level_5: All 27 bones, the table, and every cast shadow look completely motionless and unchanged to the eye across the entire clip: no position shift, no layering change, no shadow-direction change, no background drift, and no flicker anywhere; the spatial relationships between every bone (which is in front, which touches which, how far apart the groups are) look exactly the same from the first frame to the last.