Domain: Humanities and Social Sciences — Arts
Target concept: Paint applied to untreated wood vs. paint applied to pre-encapsulated wood

Video generation prompt: Two identical wooden boards are placed side by side on the workbench: the one on the left is untreated raw wood, and the one on the right is a board that has been sealed. A uniform layer of liquid coating is applied to both boards.

Evaluation guide:
(i) Target concept: Differential permeability of wood substrates governs liquid coating behavior.
Minimum mechanism: Raw wood must possess open pores/capillaries; encapsulation must form a continuous, non-porous physical barrier; liquid coating must exhibit finite viscosity and surface tension to manifest absorption vs. beading.
(ii)Storyline: Frame 1–2: Static wide shot showing two boards side-by-side on workbench, clearly differentiated by surface texture (porous left, smooth right). Frame 3–5: Coating tool enters frame and makes simultaneous, continuous contact with both boards’ surfaces. Frame 6–9: Real-time divergence emerges: left board darkens progressively from point of contact outward; right board retains intact, reflective liquid layer with defined perimeter. Frame 10: Final static hold confirming sustained dichotomy: no blending, fading, or equilibration. Perspective: Fixed frontal view, eye-level, full-board framing; no occlusion; both boards equally lit and in focus throughout.

Manual:
Experimental Procedure
1. Place two identical wooden boards side-by-side on a flat workbench.
2. Confirm left board is untreated raw wood (exposed grain, no surface coating); right board is pre-encapsulated (smooth, sealed surface).
3. Apply a uniform layer of identical liquid coating simultaneously to both boards using same tool and motion.
Observation of Experimental Phenomena
- Untreated board: coating rapidly absorbs, darkens surface, loses gloss, reveals dampened grain texture.
- Sealed board: coating remains as a distinct, unabsorbed liquid layer with consistent reflectivity, sharp edge definition, and no penetration.
Summary of Experimental Principles
Paint applied to untreated wood penetrates porous structure, causing absorption and irreversible binding. Paint applied to pre-encapsulated wood cannot penetrate the impermeable barrier, remaining as a superficial, removable film — demonstrating how surface preparation dictates coating adhesion and performance.

Prompt Grounding rubric:
level_1: No two wooden boards are shown, or only one board appears, or the two boards are not placed side by side on a workbench, or no liquid coating is ever applied to either board, or the coating is shown already present on the boards before they are placed, or the two boards look identical with no visible difference between an untreated and a sealed surface.
level_2: Two wooden boards appear roughly side by side on a workbench, but at least one setup detail is wrong or missing: the left board's raw, open-grain surface isn't visible, the right board's smooth sealed surface isn't visible, only one of the two boards ever receives coating, or the coating is applied before both boards are in position.
level_3: Two wooden boards sit side by side on a workbench; the left board shows a visibly porous, matte, open-grain surface with no sheen; the right board shows a smooth, sealed surface with a uniform sheen or thin sealant film; after both boards are in place, a liquid coating is visibly applied to both, matching the objects, positions, and order of actions in the prompt.
level_4: Meets all the level-3 requirements above, and additionally: both boards stay in their placed position on the workbench while being coated, with no sliding, lifting, or repositioning of either board, and no extra props (labels, gloves, extra containers, a second coating tool) appear that go beyond the prompt's simple two-board setup.
level_5: Meets all the level-4 requirements above, and additionally: coating begins on both boards within the same shot rather than one board being coated in an earlier cut; each board's coating covers its entire visible face with no bare, uncoated patches; and the whole sequence (from the two boards being placed to both being coated) plays out in one continuous shot with no jump cut or camera reframing.

Scientific and Causal Correctness rubric:
level_1: The two boards show no meaningful difference in how the coating behaves: for example, the coating beads up unchanged on both boards, or it soaks in and darkens both boards the same way, or the sealed board's surface ends up looking just as darkened and soaked-through as the untreated board's, with no distinguishing behavior between them at all.
level_2: A difference between the two boards appears, but it runs backwards or is scientifically inconsistent: the untreated (left) board's coating beads up and sits on the surface while the sealed (right) board's coating darkens and soaks in, or the sealed board shows a faint, ambiguous patch of darkening that could pass for absorption while the untreated board shows no visible change either.
level_3: The untreated board's coating visibly darkens the wood, sinks into the grain, and leaves a dulled, matte, dampened look; the sealed board's coating stays on top as a distinct, cohesive liquid layer with visible sheen and a clean edge; the contrast between 'soaked into the wood' and 'sitting on top of it' is visible, even if it's only clearly shown at one moment in the clip.
level_4: Meets all the level-3 requirements above, and additionally: the darkening on the untreated board spreads outward from where the coating first touches it rather than appearing everywhere at once; the coating on the sealed board stays intact and unbroken across its whole application, with no patch of it cracking or soaking in; and neither board shows a mixed result, such as a beaded patch on the untreated board or a soaked patch on the sealed board.
level_5: Meets all the level-4 requirements above, and additionally: by the end of the clip the coating has clearly absorbed into the untreated board everywhere it touched, and it remains an unbroken liquid layer everywhere on the sealed board, with no ambiguous, half-absorbed patches left on either board; the untreated-vs-sealed contrast is unmistakable and holds up across the whole coated surface.

Spatiotemporal Consistency rubric:
level_1: A board or the workbench appears to jump to a different spot between frames, or a board vanishes and reappears; the coating appears already fully applied with no application motion ever shown; the light source or the direction of the shadows on the boards suddenly changes with no cause; or a board flips to show a different face than before.
level_2: The coating tool's motion breaks down: it jumps from one spot to another without crossing the space in between, freezes mid-stroke for a noticeable stretch, or skips over sections of a board's surface; one board shifts slightly relative to the other or to the workbench between frames; or the workbench itself appears to bend, tilt, or rotate.
level_3: Both boards stay in the same position relative to each other and the workbench for the whole clip; the coating tool moves smoothly along each board's surface with no jumps; the light source stays put, so the shadows on both boards point the same direction throughout; and neither board changes shape or appears to warp.
level_4: Meets all the level-3 requirements above, and additionally: the camera holds one fixed framing with no panning, tilting, or zooming; the two boards' edges and relative sizes stay consistent from frame to frame; and the coating tool travels in a level, straight path along each board without suddenly lifting or tilting.
level_5: Meets all the level-4 requirements above, and additionally: the coating tool's motion and the spreading coating on both boards look continuously smooth with no visible stutter or skipped motion; the edges of each board and the boundary of the coating on each surface stay visually steady with no drifting, doubling, or warping; and the shadows and reflections on the boards change smoothly in step with the coating's progress, with no visible cut, splice, or added/removed element.