Domain: Healthcare — Anthropotomy
Target concept: The Composition and Morphology of the Thoracic Cage

Video generation prompt: An adult thoracic cage specimen is placed on the table for observation of its overall morphology, structural composition, and arrangement of the ribs.

Evaluation guide:
(i) Target concept: Structural composition and spatial arrangement of the adult human thoracic cage as a functional anatomical unit.
Minimum mechanism: Specimen must be an intact, dry, articulated adult human skeleton segment preserving true osteological relationships: no reconstruction, no modeling, no disarticulation errors.
(ii)Storyline: Frame opens on neutral tabletop → thoracic cage specimen enters view (or is already fully in frame) in stable, centered, frontal orientation → viewer observes complete set of ribs (1–12), sternum (three-part), and thoracic vertebrae (T1–T12) in correct anatomical juxtaposition → all structures remain motionless and fully visible for duration → viewpoint remains fixed, lighting constant, no occlusion or distortion; peripheral anatomy (e.g., clavicles, scapulae) must be absent unless naturally attached and anatomically accurate (clavicles may appear but not scapulae).

Manual:
Experimental Procedure
1. Place one intact adult human thoracic cage specimen centrally on a neutral tabletop.
2. Position camera for frontal, fixed-angle view capturing full bilateral ribcage, sternum, and thoracic vertebrae.
Observation of Experimental Phenomena
- Twelve pairs of ribs arranged in continuous curved arches; sternum centered midline with manubrium, body, xiphoid; thoracic vertebrae aligned posteriorly with characteristic spinous processes.
Summary of Experimental Principles
The thoracic cage comprises 12 thoracic vertebrae, 24 ribs (12 pairs), and the sternum — forming a rigid yet flexible bony enclosure protecting thoracic organs and enabling respiratory mechanics.

Prompt Grounding rubric:
level_1: No thoracic cage specimen appears on the table; or other unrelated objects dominate the frame; none of the ribs, sternum, or thoracic vertebrae can be identified as such.
level_2: A thoracic cage specimen is present but poorly positioned (tilted more than about 45°, hanging, or mostly blocked from view); the table surface itself is hard to make out; fewer than three ribs can be told apart; the sternum or the thoracic vertebrae are missing or not recognizable.
level_3: One thoracic cage specimen lies flat and fully visible on a clearly visible table; at least five ribs, plus the sternum and thoracic vertebrae, are all present and arranged the way a real ribcage would be; nothing else in the shot competes for attention; the camera view (straight-on or slightly angled) still shows the whole structure.
level_4: Everything required for score 3 holds, and additionally the ribs run in an unbroken arc from rib 1 down to rib 12 with no visible gaps in the sequence; the sternum sits centered and in line with the spine; no unrelated skeletal parts (skull, pelvis) appear; the table is plain and doesn't distract from the specimen; no on-screen text or graphics are overlaid.
level_5: Everything required for score 4 holds, and additionally all twelve ribs are fully visible, unbroken, and clearly attached to the sternum (ribs 1–7) or to the vertebral column (all ribs); the joints where ribs meet the sternum and spine look proportionate and structurally sound; nothing about the lighting hides the specimen's shape; the fixed camera view shows both sides of the ribcage evenly with no cropping or distortion.

Scientific and Causal Correctness rubric:
level_1: The specimen shows anatomy that couldn't exist: ribs fused into one solid plate, no sternum with ribs attaching straight to the spine instead, vertebrae turned to face sideways, or ribs curving inward toward the spine instead of outward; or the material looks like plastic mesh or a flat cartoon outline rather than bone.
level_2: At least one major anatomical error is visible: a rib count that isn't 12 pairs, a sternum sitting off to the side of the ribs instead of centered in front, ribs 1–7 not connecting to the sternum at all, or thoracic vertebrae missing their spinous processes or looking like lumbar vertebrae instead.
level_3: Ribs 1 through 12 appear in matching left-right pairs; the sternum sits at the midline in its three parts (manubrium, body, xiphoid process); the thoracic vertebrae show their typical heart-shaped bodies with spinous processes pointing downward; the ribs curve outward the way real ribs do; nothing about the shapes contradicts each other (e.g., rib 1 sitting near-vertical while rib 7 lies near-horizontal, which wouldn't happen together).
level_4: Everything required for score 3 holds, and additionally the rib attachments follow the real pattern: ribs 1–7 reach the sternum directly, ribs 8–10 connect via cartilage above them, ribs 11–12 are the free-floating 'floating ribs'; the vertebrae's side processes line up with ribs 1–10; from the front, the ribs stack in the correct front-to-back layering with no rib awkwardly poking in front of one it should be behind.
level_5: Everything required for score 4 holds, and additionally the proportions look right throughout: the sternum is roughly a third of the ribcage's total height, rib 1 is the shortest and most level of the true ribs, rib 7 is the longest and most slanted, ribs 11–12 are the shortest and point most toward the back; every rib has a consistent bony surface texture; nothing looks biomechanically wrong, like a floating rib appearing to pass through a vertebral body.

Spatiotemporal Consistency rubric:
level_1: The specimen suddenly appears in a different spot or vanishes and comes back; the table seems to blink in and out of existence; the lighting switches from front-lit to side-lit in an instant with no transition; the specimen rotates more than about a quarter turn with no motion shown getting there; a rib appears to detach or break apart partway through.
level_2: The specimen shifts sideways by more than about a quarter of its own width between moments; the edge of the table flickers in and out; a shadow falls in a direction that doesn't match where the light seems to be coming from; one rib looks like it bends or warps unnaturally at some point in the clip.
level_3: The specimen stays in the same spot and orientation for the whole clip; the table stays fully visible and steady; the lighting doesn't flicker or suddenly brighten or dim; every rib, the sternum, and the vertebrae keep their rigid, unbroken shape with no visible tearing or stretching between moments.
level_4: Everything required for score 3 holds, and additionally the camera holds completely still with no panning, tilting, or zooming; none of the anatomical structures appear to shift depth relative to each other as if the camera moved; shadows fall the same way and with the same softness throughout; the specimen shows no visible trembling or drifting for the entire clip.
level_5: Everything required for score 4 holds, and additionally the pacing feels perfectly smooth with no skipped or frozen frames and no blur or flicker that would be inconsistent with something sitting still; the front ribs consistently appear to sit in front of the ones behind them wherever that's anatomically expected, with no flip-flopping in which rib looks closer.