Domain: Humanities and Social Sciences — Linguistics
Target concept: The pitch of the sound causes the thin plastic wrap covering a bowl of water to vibrate.

Video generation prompt: A transparent bowl containing clear water is tightly covered with a thin layer of plastic wrap, with a few grains of dry rice resting on its surface, while someone leans in close and loudly emits a steady tone directly at the wrap.

Evaluation guide:
(i) Target concept: Airborne sound pressure waves at audible frequencies, emitted loudly at close range, induce resonant vibration in a thin, taut, flexible membrane (plastic wrap) stretched over a dense, immobile boundary (water surface); a few light rice grains resting on the membrane act as a visible tracer of this vibration, since the wrap's own motion can be too subtle to see directly. Minimum mechanism: sound must be emitted directionally and loudly at close range toward the wrap; the wrap must be thin and taut so it responds to the small acoustic pressure forcing; the rice grains must be light enough to be displaced by the wrap's motion; the water must stay quiescent, acting as a rigid acoustic backing that reflects incident sound energy back into the wrap.
(ii) Storyline: [Frame 0–2] Static setup: transparent bowl with clear water, plastic wrap taut and still, a few rice grains resting motionless on the wrap. [Frame 3–4] Person leans close, mouth opens, begins a loud tone aimed at the center of the wrap. [Frame 5–8] The rice grains begin visibly jumping and trembling in place on the wrap surface; the wrap itself may show a subtle shimmer; the water remains optically still with no surface disturbance. [Frame 9] Tone ends: mouth closes; the grains settle back to rest almost immediately. Perspective: fixed frontal close-up view capturing the full bowl, water surface, wrap, rice grains, and the person's mouth; no occlusion, no angle distortion, lighting that clearly shows the wrap and the grains on it.

Manual:
Experimental Procedure
1. Place a transparent bowl on a stable surface.
2. Fill it with clear water to just below the rim.
3. Stretch a thin plastic wrap tightly over the entire water surface, sealing it flush.
4. Sprinkle a few grains of dry rice evenly across the wrap's surface.
5. Position a person close to the bowl, facing the wrap.
6. The person leans in and emits a loud, steady tone directly at the wrap.
Observation of Experimental Phenomena
The rice grains on the plastic wrap visibly jump and tremble in place only while the tone is being emitted, and settle back to rest when the tone stops; the wrap itself may shimmer subtly; the water surface remains still and flat throughout.
Summary of Experimental Principles
The pitch and loudness of the sound cause the thin plastic wrap covering a bowl of water to vibrate, and this vibration is made visible by the jumping of light rice grains resting on the wrap.

Prompt Grounding rubric:
level_1: No transparent bowl is present; no clear water is visible; no plastic wrap covers any surface; no rice grains are visible anywhere; no person or sound-emitting figure appears near the bowl: none of the five required setup elements (transparent bowl, clear water, taut plastic wrap, rice grains on the wrap, person facing the bowl) are shown.
level_2: At least one required setup element appears (e.g., a bowl, or water, or plastic wrap), but the setup is otherwise incomplete: the bowl is opaque or absent, the water is colored/murky/missing, the plastic wrap is thick/rigid/loose or absent, no rice grains are visible on the wrap, or no person is shown near the bowl with a mouth oriented toward it.
level_3: All five setup elements are present and correctly typed: (1) a transparent bowl, (2) clear water inside it, (3) a thin plastic wrap tightly covering the water surface, (4) a few visible rice grains resting on the wrap, (5) a person positioned close to and facing the bowl with mouth open toward the wrap, but at least one spatial or structural mismatch exists, such as the wrap sagging or loose, the bowl tilted, the water level low enough that the wrap touches the bowl's sides, the rice grains bunched off to one side, or the person facing away from or too far from the wrap.
level_4: All five setup elements are present, correctly typed, and largely well-arranged: the bowl is upright, the water is near the rim, the wrap is mostly taut across the water surface, rice grains rest on the wrap, and the person is close to and facing the bowl, but one minor imperfection remains, such as a slight wrinkle or looseness in the wrap, an uneven scattering of the rice grains, or the person positioned a bit off-center relative to the wrap.
level_5: The setup is rendered with full fidelity for as long as it is shown: the transparent bowl is upright and stationary; the clear water fills the bowl to near the rim; the thin plastic wrap is taut and flush across the entire water surface with no wrinkles, gaps, or slippage; a few rice grains rest undisturbed on the wrap in their initial positions before any tone begins; and the person is positioned close to and squarely facing the bowl with mouth clearly oriented toward the center of the wrap; every element is correctly typed and positioned throughout.

Scientific and Causal Correctness rubric:
level_1: There is no causal link between the person's tone and the rice grains' behavior: the grains stay still even while the tone is clearly being emitted, or the grains move continuously regardless of whether a tone is present; the water shows splashing, boiling, or swirling unrelated to any sound; or the wrap detaches, tears, or lets the grains fall into the water.
level_2: The grains or wrap move, but not in a way sound pressure on a taut membrane could produce: e.g., the grains scatter or fly off the wrap as if hit by a gust of wind, the wrap billows or flaps with large sweeping motion, the movement starts before the tone begins or continues well after it ends with no alignment to the tone, or the water surface visibly ripples while the wrap and grains stay still.
level_3: The grains or wrap move in time with the person's tone, but the movement is not the kind a vibrating membrane would produce: for example the grains merely slide slowly across the wrap surface rather than bouncing in place, or the wrap shows one slow, large bulge or dimple rather than a rapid small-scale tremor; the water stays flat and undisturbed, but the response is too slow and too large in scale to look like membrane resonance.
level_4: The rice grains visibly jump and tremble in place on the wrap (a rapid, small-scale bouncing rather than sliding or scattering) only while the tone is being emitted, no grain flies off the wrap or falls into the water, and the water surface stays macroscopically still with no ripples, but the jumping is noticeably uneven across the wrap, for example strong near the middle and almost absent near the rim, more asymmetric than expected for a tone aimed at the wrap's center.
level_5: The rice grains begin jumping and trembling in place almost as soon as the tone starts and settle back to rest almost as soon as the tone stops; the jumping is rapid and small in scale (repeated bouncing in place) rather than sliding, scattering, or a single slow bulge; the response is reasonably even across the grains near the tone's aim point, with no grain flying off the wrap or into the water; and the water surface stays completely flat and undisturbed throughout, consistent with the wrap's motion being driven by the airborne tone rather than by any other disturbance.

Spatiotemporal Consistency rubric:
level_1: The bowl, wrap, or person jumps to a different position or vanishes and reappears between moments in the video; the plastic wrap or the rice grains disappear and then reappear; the person's head or mouth relocates or rotates with no continuous path of motion; the scene switches from bright light to near darkness (or back) between two adjacent moments; or the wrap or bowl bends/folds in a way a real sheet of plastic or a rigid bowl could not.
level_2: Several noticeable but less extreme breaks occur: the edge of the plastic wrap briefly disappears and then reappears; the person's head or mouth jumps from one position to another without passing through the space in between; the bowl appears to rock or slide with no visible cause; the shadow cast by the rice grains or the bowl points in a different direction than the room's apparent light source at some point; or reflections on the water surface do not match the wrap or bowl sitting above it.
level_3: One clear spatiotemporal flaw remains: for example, the wrap briefly turns cloudy or opaque and then clears again for no reason; the person's mouth opens but the jaw and lips do not move in a way consistent with speaking or blowing air; the bowl's position shifts noticeably between two moments without a smooth path connecting them; or the bright highlight on the wrap's surface jumps from one side to the other with no corresponding change in the person's position or the implied light source.
level_4: The bowl stays upright and in the same spot, the wrap stays taut and fully covers the water without stretching, tearing, or sliding off, the rice grains stay in their region of the wrap aside from any tone-driven jumping, the person keeps a stable frontal pose facing the bowl, and the lighting stays steady with the highlight on the wrap and the shadow beneath the bowl in the same place throughout, but there is a small amount of frame-to-frame jitter, or brief blur on the moving mouth, that a viewer could notice without it making the scene look unstable overall.
level_5: The bowl, water, wrap, rice grains, and person all stay exactly where they should be relative to one another for the entire video, with no flicker, no vanishing or reappearing, and no blur on anything meant to be still; the person's mouth moves the way a real mouth would when speaking or blowing air; the highlight on the wrap and the shadow the bowl casts stay in the same place and at the same brightness from the first moment shown to the last; and the framing, scale, and camera angle never shift.