Domain: Healthcare — Anthropotomy
Target concept: Overall Morphology and Structure of the Skull

Video generation prompt: A set of adult skull specimens is placed on the table for observation of their overall morphology, the division between the cranial vault and the cranial base, and the major bony landmarks.

Evaluation guide:
(i) Target concept: Visual verification of adult human skull morphology, specifically the structural distinction between cranial vault and cranial base, and the presence/position of canonical bony landmarks.
Minimum mechanism: Skull specimens must be static, dry, unfixed adult human crania with intact, unpainted bone surfaces; viewing angle must preserve depth cues to resolve vault-base topographic relationship without parallax-induced ambiguity.
(ii)Storyline: [Frame 0–3] Two+ skulls settle onto table surface and come to rest; [Frame 4–7] Fixed camera reveals lateral profile of primary specimen, exposing vault convexity tapering into base irregularity; [Frame 8–10] Viewer perceives continuous contour between vault and base, with at least three major landmarks simultaneously identifiable in correct spatial arrangement; no hand interaction, no lighting change, no motion beyond initial settling.

Manual:
Experimental Procedure
1. Place two or more anatomically accurate adult human skull specimens side-by-side on a flat, neutral-colored table.
2. Position the camera in a fixed frontal-to-oblique view to capture the full lateral profile of at least one specimen.
3. Ensure unobstructed visibility of the cranial vault (the domed, superior part) and the cranial base (the lower, more irregular part) as connected bony regions.
Observation of Experimental Phenomena
- The cranial vault and cranial base appear as two visually distinct but continuously joined bony regions.
- Major bony landmarks — including the frontal eminence, external occipital protuberance, zygomatic arch, and mastoid process — are visible as discrete, correctly positioned structures (paired where the skull is normally paired, single where it is normally a single midline feature).
Summary of Experimental Principles
- The adult human skull is made up of the neurocranium, which itself includes the cranial vault (protecting the brain from above) and the cranial base (the floor of the braincase, housing foramina for nerves and vessels), and the viscerocranium — the facial skeleton (maxilla, mandible, nasal and zygomatic bones, etc.) — which is a separate division of the skull and is not part of the cranial base.
- The vault-base boundary shows up as a gradual change in contour and bone thickness — from the smooth, thin, domed vault to the thicker, more irregular base — rather than as a single suture line or flat plane.

Prompt Grounding rubric:
level_1: No adult human skull specimens are visible on the table, or what is shown is clearly not a real skull (a toy, an animal skull, a cartoon rendering, or a broken/reconstructed fragment), or there is no table surface, or the camera never settles into a stable view of the specimens.
level_2: At least one skull sits on the table, but either only one specimen is shown when two or more are expected, the skull looks implausible for an adult human (wrong proportions, missing major features), the specimen is tipped over, hanging, or largely blocked from view, or the camera angle never lets the vault and the base be seen at the same time.
level_3: Two or more plausible adult human skull specimens rest side by side on a flat table; the camera holds a fixed frontal-to-oblique angle that keeps at least one specimen's full side profile unobstructed; on that specimen, the domed upper vault and the rougher lower base read as two connected regions of bone rather than a single featureless shape.
level_4: Everything at level 3 holds, and on at least one specimen three or more named landmarks, for example the brow ridge (frontal eminence), the bump at the back of the skull (external occipital protuberance), the cheekbone arch (zygomatic arch), or the bony knob behind the ear (mastoid process), are sharp and unblurred rather than smeared together, and the vault flows into the base without any visible gap, seam, or cut line.
level_5: Everything at level 4 holds, and every specimen shown keeps normal adult proportions with no obvious distortion (no flattened dome, no oversized central opening, no suture lines that look freshly split open); the change in contour and surface texture from the smooth, thin vault to the thicker, more irregular base reads as a gradual transition around the specimen rather than a hard edge; and nothing else (no label, arrow, hand, or tool) ever enters the frame.

Scientific and Causal Correctness rubric:
level_1: The specimens show impossible skull anatomy: the vault and base blend into one unbroken dome with no structural division at all, the skull has non-human features (horns, an elongated snout, teeth growing out of the vault), or a landmark sits somewhere it cannot exist on a real skull (for example, a mastoid process on the forehead).
level_2: There is a visible gap or misalignment where the vault should meet the base, as if the two parts do not belong to the same skull; a landmark that should be visible is missing entirely (no bump where the external occipital protuberance should be at the back of the skull); or a landmark sits in the wrong place (a zygomatic arch that appears to originate from the top of the skull instead of the cheek region).
level_3: The vault and base read as two distinct regions of bone joined by a continuous contour, with no gap or mismatch between them; at least one specimen shows two landmarks in roughly correct locations (for example, the brow ridge sitting above the eye sockets, and the external occipital protuberance at the midline of the back of the skull); nothing contradicts basic skull structure, such as the base looking thicker than the vault while still being fully covered by it.
level_4: Everything at level 3 holds, and every landmark shown sits in its correct position and orientation relative to its neighbors (for example, the bony knob behind the ear sits below and behind the ear opening, not in front of or above it); the change from vault to base follows a gradual curve rather than a straight or sharply angled line; and no landmark appears doubled, flipped, or mirrored unless the skull's normal left-right symmetry calls for a matching pair.
level_5: Everything at level 4 holds, and the vault reads as a thinner-walled, evenly domed shell compared to the thicker, more irregular bone of the base; paired landmarks (left and right zygomatic arches, left and right mastoid processes) look symmetric, while single midline landmarks (the external occipital protuberance) appear only once; and no landmark looks like it is growing out of or piercing through a neighboring bony region, and no suture at the vault-base junction looks freshly split open on what is otherwise an adult specimen.

Spatiotemporal Consistency rubric:
level_1: A skull specimen jumps to a different spot on the table between frames, the lighting suddenly changes in a way that alters how the shape reads, the camera suddenly zooms or crops so the vault-base relationship is lost, or the footage stutters or glitches badly enough to break the sense of continuous viewing.
level_2: A specimen visibly wobbles or rotates on its own with no hand or cause shown; the shadows the specimens cast swing to a different angle partway through the clip; the tabletop appears to bend or ripple; or part of the vault-base contour on a specimen seems to vanish for a moment and then come back.
level_3: Every specimen stays put on the table for the whole clip with no jumping, warping, or pieces disappearing; the light keeps coming from the same direction with steady brightness; the camera holds one fixed framing with no pan, tilt, or zoom; and the contour from vault to base stays visible and unbroken in every frame.
level_4: Everything at level 3 holds, and the bone surfaces look steady rather than shaky or shimmering frame to frame; the shadow each specimen casts on the table keeps a consistent direction and softness; and the view is not stretched or skewed in a way that makes the vault or base look wider or narrower than it should.
level_5: Everything at level 4 holds, and comparing early and late frames, every visible landmark (even ones near the edge of the frame) stays in the same place without any visible drift, wobble, or sliding; any bright highlight on the bone surface moves smoothly and believably if the framing changes at all; and fine surface details such as the ridge above the eye sockets or the lines at the back of the skull stay visually stable rather than shimmering or flickering.