Domain: Humanities and Social Sciences — Archaeology
Target concept: The residual lipids on the ceramic fragments caused water droplets to accumulate (hydrophobic effect).

Video generation prompt: Place the two ceramic fragments side by side, one with a darker color due to use, and the other just cleaned; add drops of water to both and gently tilt the table forward and backward.

Evaluation guide:
(i) Target concept: Surface hydrophobicity induced by archaeological residue (lipids) alters water interaction on ceramic.
Minimum mechanism: (a) Lipid layer must persist on darker fragment and be removed from lighter fragment; (b) Water must be pure (no surfactants); (c) Tilting provides gravitational shear force sufficient to reveal mobility difference; (d) Lighting/viewing angle must allow droplet shape and motion to be resolved; (e) Both fragments must have a smooth, low-porosity (e.g., burnished) surface finish so that droplets remain on top of the surface long enough for the tilt to reveal any mobility difference, rather than being absorbed into a coarse, highly porous body before tilting begins.
(ii)Storyline: Frame opens on static side-by-side fragments (color contrast visible) → water drops applied simultaneously and settle → forward tilt begins → droplets on darker fragment retain shape; droplets on lighter fragment visibly spread/slide → forward tilt completes and pauses → backward tilt begins → same differential behavior repeats → backward tilt completes → final static frame shows residual droplet states. All events occur in fixed viewpoint, no cuts, no object repositioning, no lighting intervention.

Manual:
Experimental Procedure
1. Place two ceramic fragments side by side on a flat table: left fragment visibly darker (used, retaining absorbed lipid residue), right fragment visibly lighter (cleaned). Both fragments have a smooth, burnished (low-porosity) surface, so applied water droplets sit on the surface rather than soaking in immediately.
2. Apply one water drop to the center of each fragment.
3. Gently tilt the table forward (away from viewer), hold briefly, then tilt backward (toward viewer).
Observation of Experimental Phenomena
On the darker (used) fragment, the water droplet stays rounded and roughly in place; on the lighter (cleaned) fragment, the water droplet spreads, flattens, or slides during the tilt.
Summary of Experimental Principles
Residual lipids absorbed into the used ceramic's surface create a hydrophobic layer that keeps its droplet beaded up and resistant to sliding; the cleaned, lipid-free surface is comparatively hydrophilic, so water wets and moves across it more readily when the table is tilted.

Prompt Grounding rubric:
level_1: No two ceramic fragments are shown, or only one appears, or no water drops are applied to either fragment, or no tilting motion happens, or the fragments are never placed side by side, or there is no visible color difference between them.
level_2: Two ceramic fragments are placed side by side, but at least one of these elements is missing: a visible color difference between them (one darker/used, one lighter/cleaned), water drops applied to both, a tilt performed in both the forward and backward direction, or the whole sequence captured in one continuous shot.
level_3: Both fragments are side by side in the same shot, one visibly darker (used) and one visibly lighter (cleaned); a water drop is applied to each; the table is tilted forward and then backward in one continuous shot; however at least one part is unclear, such as the drops not staying visible on both fragments throughout the tilt, the two fragments partly overlapping or blocking one another, or the forward/backward tilt sequence not being clearly distinguishable.
level_4: Everything from the 3-point level holds, and in addition: the water drop on each fragment is clearly visible before and during the entire tilt sequence, the two fragments sit fully side by side with no overlap or rotation into each other, the forward tilt clearly happens before the backward tilt (not simultaneously or reversed), and both fragments stay fully in frame the whole time with no cut or repositioning.
level_5: Everything from the 4-point level holds, and in addition: the water drop is placed on each fragment before any tilting starts, both fragments and their drops remain the only subjects in frame from a single fixed camera position (no zooming, refocusing, or lighting change), and the tilt is performed as one smooth forward-then-backward motion with no jump cuts or reintroduction of either fragment mid-sequence.

Scientific and Causal Correctness rubric:
level_1: Water behaves identically on both fragments (no visible difference in droplet shape or movement), or a droplet vanishes or appears without the tilt causing it, or the color contrast between fragments is reversed (the cleaned fragment looks darker than the used one), or no droplet-related change is shown at all.
level_2: Water is applied to both fragments, but there is no visible difference in how the droplets behave during the tilt, or the difference is reversed (the droplet on the darker/used fragment is the one that spreads or slides, not the one on the lighter/cleaned fragment), or the color contrast between fragments is missing or backwards.
level_3: The droplet on the darker (used) fragment stays rounded and roughly in place during the tilt; the droplet on the lighter (cleaned) fragment visibly spreads, flattens, or slides during the tilt; the color contrast between the two fragments is visible and consistent with one being used/residue-bearing and the other freshly cleaned; however at least one of the following is true: the spreading/sliding on the cleaned fragment is only visible in the before/after shots rather than during the tilt itself, the difference in behavior doesn't appear to be triggered by the tilt, or the color contrast between the two fragments is only subtly visible rather than clearly distinguishable.
level_4: Everything from the 3-point level holds, and in addition: the spreading or sliding of the droplet on the cleaned fragment clearly starts once the tilt begins (not before or only afterward), the used fragment maintains a visibly darker color than the cleaned fragment throughout while both fragments show the same smooth, burnished surface finish, and neither fragment shows contradictory behavior (no sliding on the used fragment, no beading up on the cleaned one).
level_5: Everything from the 4-point level holds, and in addition: the droplet on the used fragment stays rounded and in place through both the forward and the backward tilt, the droplet on the cleaned fragment keeps moving or spreading in the direction of the tilt during both tilt phases, the color contrast between the two fragments stays visible throughout, and at no point does either droplet behave in a way that contradicts which fragment is water-repelling and which is water-wetting.

Spatiotemporal Consistency rubric:
level_1: One of the ceramic fragments suddenly appears in a different position or orientation, a water droplet appears or disappears without the tilt causing it, the lighting flips direction abruptly between tilt phases, a fragment visibly warps or breaks, or the background changes without any explanation.
level_2: One fragment briefly leaves the frame during the tilt and is not consistently shown re-entering, a hand or tool partially covers a fragment in a way that isn't consistent from one moment to the next, the shadow cast on the table looks different between the forward and backward tilt in a way that doesn't match a single light source, or the image visibly refocuses partway through the motion.
level_3: Both fragments stay in the same relative position to each other throughout; neither fragment nor droplet disappears and reappears; there is no sudden lighting or shadow change; neither fragment shows warping or tearing; however at least one smaller issue remains, such as a visibly jerky or halting tilt motion, a background element that shifts out of proportion to the fragments' movement, or a hand/tool that appears during the forward tilt but not the backward tilt (or vice versa).
level_4: Everything from the 3-point level holds, and in addition: the tilt motion is smooth and continuous with no visible jerks or halts, background elements shift in proportion to the fragments as a rigid tabletop would tilt (not sheared or distorted unevenly), any visible hand or tool keeps the same spatial relationship to the fragments across the whole sequence, and the lighting/shadow geometry stays physically consistent through both the forward and backward tilt.
level_5: Everything from the 4-point level holds, and in addition: neither fragment's edges nor the droplets show smearing inconsistent with how fast they are moving, both fragments and their droplets stay equally in focus throughout (no part goes soft while another stays sharp), the droplets' shape changes look like natural wobble from the tilt rather than an odd, uneven flicker, and the tabletop and fragments don't visibly stretch or skew the way a distorted lens would show during the tilt.