Domain: Healthcare — Anthropotomy
Target concept: Clavicular and Scapular Morphology

Video generation prompt: A set of adult clavicles and scapulae are placed on the table for observation of their morphology, bony landmarks, and spatial relationships.

Evaluation guide:
(i) Target concept: Static, frontal tabletop display of anatomically accurate adult human clavicles and scapulae enabling direct observation of morphology and spatial relationships.
Minimum mechanism: Bones must be real or photorealistically replicated dry skeletal specimens (not diagrams, models, or CT renderings); lighting must be diffuse and shadow-consistent; camera must be stationary with fixed focal length and focus plane encompassing entire bone set.
(ii)Storyline: [Frame 0–10] Stable overhead/oblique frontal view of neutral tabletop → [Frame 1–10] Four bones enter static composition: two clavicles aligned horizontally in upper half, two scapulae aligned horizontally in lower half, all fully visible and non-overlapping → [Causal transition] Placement action concludes before observation begins; no motion occurs during evaluation window → [Visibility constraint] All bony landmarks must reside within central 80% of frame and be unobscured; no hand, tool, or label may enter frame; lighting must allow unambiguous discrimination of acromion vs. coracoid, sternal vs. acromial end.

Manual:
Experimental Procedure
1. Place two adult dried clavicles (left and right) side-by-side horizontally on a neutral-colored tabletop.
2. Place two adult dried scapulae (left and right) side-by-side below the clavicles, aligned laterally.
3. Ensure all bones lie flat, uncovered, and fully within frame.
Observation of Experimental Phenomena
- Clavicles appear S-shaped with distinct sternal and acromial ends.
- Scapulae appear triangular with visible spine, acromion, coracoid process, and glenoid cavity.
- Clavicles sit superior to scapulae; scapulae lie lateral to clavicle ends.
Summary of Experimental Principles
Clavicular and scapular morphology reflects functional adaptation: clavicle acts as strut linking axial and appendicular skeleton; scapula provides muscular attachment and articulates with humerus and clavicle. Landmarks define muscle origins/insertions and joint axes.

Prompt Grounding rubric:
level_1: No adult clavicles or scapulae visible; or objects present are not identifiable as human skeletal elements; or no table surface present; or scene is not static frontal tabletop view.
level_2: At least one clavicle OR one scapula is present on a table surface, but both types of bones are not simultaneously visible; or bones are obscured by hands/tools/occlusion; or view includes non-table surfaces (e.g., hand-held, angled floor shot, background clutter).
level_3: Both adult clavicles AND adult scapulae are simultaneously visible on a flat, neutral tabletop surface in a single continuous shot; all bones are fully uncovered and oriented such that bony landmarks could be discerned; viewpoint is stable frontal/oblique overhead (no rotation, zoom, or panning).
level_4: All conditions for score 3 are met, AND bones are arranged side-by-side with clear spatial separation (no overlapping, stacking, or nesting); clavicles and scapulae are placed in anatomically plausible orientations (clavicle long axis horizontal, scapula medial border vertical or near-vertical); no extraneous objects (e.g., labels, rulers, gloves) appear.
level_5: All conditions for score 4 are met, AND the clavicles and scapulae are arranged in matched left-right pairs: two clavicles (left/right) and two scapulae (left/right), each pair visibly symmetric in orientation and placement; all four bones sit in the same focal plane, with none blurred or soft-focus while the others are sharp; illumination falls evenly across all four bones, with no single bone thrown into shadow relative to the others.

Scientific and Causal Correctness rubric:
level_1: Bones shown are morphologically inconsistent with human adult clavicles or scapulae (e.g., wrong proportions, absent acromion/coracoid process, fused or segmented clavicle, scapula lacking spine or glenoid cavity); or bone color is non-osseous (e.g., blue, green, metallic, translucent).
level_2: At least one bone displays ≥1 major morphological error: clavicle missing sternal/acromial ends or curved abnormally; scapula missing spine, acromion, coracoid process, or glenoid cavity; or bone color is non-biological (e.g., pure white, yellow, black, or glossy plastic-like sheen).
level_3: All visible clavicles and scapulae display correct gross morphology: clavicles are S-shaped, elongated, with distinct sternal and acromial ends; scapulae show triangular body, prominent spine, acromion, coracoid process, and glenoid cavity; bone color is matte off-white or light beige consistent with dry skeletal preparation.
level_4: All conditions for score 3 are met, AND spatial relationships between bones are anatomically coherent: clavicles lie superior to scapulae; scapulae are positioned laterally relative to clavicles; no clavicle is placed *on* or *under* a scapula; no inversion (e.g., scapula upside-down with glenoid facing up).
level_5: All conditions for score 4 are met, AND bony landmarks are visually resolvable without ambiguity: acromion and coracoid process distinctly protrude on scapulae; sternal and acromial ends clearly differentiated on clavicles; spine of scapula forms a raised ridge; all landmarks appear in correct relative positions per anatomical standards (e.g., acromion extends laterally from spine, coracoid projects anteriorly).

Spatiotemporal Consistency rubric:
level_1: Scene contains teleportation (bones appear/disappear between frames), structural discontinuity (bone fragments, phantom limbs, torn edges), abrupt lighting shift (e.g., flash, flicker, sudden shadow), or perspective break (e.g., tabletop warping, bone floating above surface).
level_2: At least one major spatiotemporal artifact is present: persistent motion blur obscuring the S-curve of a clavicle or the triangular outline of a scapula; more than two consecutive frames with severe jitter or shake; a bone's cast shadow suddenly switching to the opposite side of the bone between frames with no corresponding change in the room's lighting; or a bone's position jumping more than its own length between frames with no visible cause.
level_3: No teleportation, no structural breaks, no abrupt lighting changes; all four bones remain fully resting on the tabletop surface throughout; each bone's cast shadow stays on the same side of the bone and keeps roughly the same length and softness in every frame; camera viewpoint remains fixed (no pan/tilt/zoom); any motion present is smooth and minimal (e.g., a gentle overall frame drift only, not the bones or shadows shifting independently).
level_4: All conditions for score 3 are met, AND inter-frame continuity is maintained: no frame duplication or drop; no strobing or flickering along any bone's edge; bone edges (e.g., the acromion's tip, the clavicle's curve) remain crisp across all frames; the tabletop surface shows the same texture and reflectance in every frame, with no shimmering or sudden change in surface appearance.
level_5: All conditions for score 4 are met, AND no perceptible spatiotemporal deviation remains: no visible shake or drift in the outline of any clavicle or scapula across frames; no parallax shift between the bones and the tabletop's edge; no lens distortion (e.g., the straight edge of the tabletop stays straight); and no frame-to-frame misalignment of any bone's contour.