Domain: Natural Science — Geology & Geophysics
Target concept: The light from a flashlight passes through transparent quartz, milky quartz, and galena samples.

Video generation prompt: On a dark table, three samples are placed side by side—on the left is transparent quartz, in the middle is milky quartz, and on the right is galena—a beam of light from a handheld flashlight sweeps from left to right behind them.

Evaluation guide:
(i) Target concept: Optical transmission differences among minerals due to internal microstructure and chemical bonding.
Minimum mechanism: Light must propagate through the mineral volume (not just reflect off surface); transmission requires absence of strong absorption/scattering centers (e.g., metallic bonds in galena absorb all visible light; fluid inclusions in milky quartz scatter light; pure quartz lattice allows coherent transmission).
(ii)Storyline: Frame 1: Static wide shot, dark table, three stationary samples in strict left–middle–right order, flashlight off or occluded. Frame 2–3: Flashlight activates behind samples; beam emerges and first contacts left edge of transparent quartz → immediate bright, crisp backlight glow appears. Frame 4–5: Beam advances across quartz → glow persists uniformly. Frame 6: Beam reaches boundary between quartz and milky quartz → quartz glow ends sharply; milky quartz glow begins: softer, lower-intensity, blurred edge. Frame 7–8: Beam traverses milky quartz → glow remains diffuse and steady. Frame 9: Beam reaches galena → milky quartz glow ends; galena shows zero transmission: solid silhouette, no glow, no edge halo. Frame 10: Beam exits galena right edge → all glow extinguished. Throughout: fixed viewpoint, no sample motion, no ambient light interference, no occlusion of beam path or samples.

Manual:
Experimental Procedure
1. Place a dark tabletop under low ambient light.
2. Arrange three mineral samples side-by-side: transparent quartz (left), milky quartz (middle), galena (right).
3. Hold a handheld flashlight directly behind the samples, aligned horizontally with their mid-height.
4. Sweep the flashlight beam steadily from left to right across the entire row of samples.
Observation of Experimental Phenomena
- Transparent quartz transmits light brightly and clearly, showing sharp backlight glow.
- Milky quartz transmits light diffusely and dimly, appearing hazy and clouded.
- Galena transmits no light — remains fully opaque with no backlight glow or silhouette detail.
Summary of Experimental Principles
Light transmission depends on mineral composition and internal structure: quartz is silica-based and optically transparent; milky quartz contains microscopic fluid inclusions that scatter light; galena is a lead sulfide ore with metallic bonding and zero transparency.

Prompt Grounding rubric:
level_1: No flashlight beam is shown at all, and fewer than two of the three required mineral samples (transparent quartz, milky quartz, galena) appear; or none of the samples sit on a dark tabletop.
level_2: All three samples sit on the dark tabletop, but not in left-to-right order (e.g., galena appears on the left instead of the right); or the lit flashlight is present but its beam doesn't come from behind the samples, isn't aligned horizontally with them, or never sweeps across the row.
level_3: Transparent quartz (left), milky quartz (middle), and galena (right) sit in the correct order on the dark table; the flashlight is held behind them and its beam is visible sweeping left to right - but the beam doesn't clearly reach or interact with all three samples (e.g., it fades out partway, or only ever lights up one sample).
level_4: All three samples appear in the correct left-middle-right order with their expected look (quartz clear, milky quartz cloudy white, galena opaque metallic gray); the flashlight stays behind the row throughout; its beam is visible sweeping continuously left to right across all three samples; and nothing extra blocks any sample during the sweep.
level_5: Everything required for a 4 is met, and in addition: the flashlight is clearly handheld (the hand or grip is visible or strongly implied by its scale and angle); the sweep keeps a steady height and speed relative to the row; all three samples stay fully visible and still for the entire sweep; and there is no jarring cut, flash, or zoom that breaks the impression of one continuous shot.

Scientific and Causal Correctness rubric:
level_1: No discernible light-transmission difference appears between the samples; all three look identically transparent or identically opaque; galena appears translucent or glowing; milky quartz appears fully transparent or fully black; or transparent quartz appears cloudy or metallic.
level_2: At least one sample shows physically implausible optical behavior: galena visibly transmits light (a glow, halo, or backlit silhouette), milky quartz appears completely clear like the transparent quartz, or transparent quartz appears fully opaque like galena - as if the beam passed through galena like glass.
level_3: The correct qualitative order is visible - transparent quartz shows a bright, sharp-edged glow when backlit; milky quartz shows a softer, hazier glow; galena blocks the beam entirely with no glow - but something is inconsistent with position or timing, e.g., milky quartz glows brighter than the transparent quartz, or galena briefly shows a backlit glow during the sweep.
level_4: All three optical responses are physically accurate and tied to the correct sample: quartz on the left shows a bright, well-defined glow; milky quartz in the middle shows a dimmer, diffused, cloud-like glow; galena on the right shows zero transmission - fully opaque with a sharp silhouette and no backlight - and each response only appears while the beam is actually on that sample.
level_5: Everything required for a 4 is met, and in addition: the glow shifts cleanly from bright to diffuse to none as the beam crosses each boundary, with no residual glow bleeding from one sample into the next; no light spills beyond a sample's physical edges; and galena's surface looks consistent with its metallic luster (reflecting a little ambient light but transmitting none).

Spatiotemporal Consistency rubric:
level_1: The samples or the flashlight suddenly change position, size, or orientation between shots; the beam flickers on and off with no clear cause; the tabletop background warps or disappears; or the ambient lighting suddenly changes (e.g., the room lights snap on) partway through the sweep.
level_2: The beam appears or disappears abruptly rather than sweeping continuously into and out of view; one or more samples shift sideways or tilt during the sweep; the flashlight-holding hand moves in a jerky, non-smooth path; a cast shadow from the hand or flashlight pops in and out inconsistently; or the background lighting noticeably brightens, dims, or changes color partway through.
level_3: The beam's width and brightness stay fairly steady as it sweeps rather than visibly narrowing and widening; the edges of the three samples look mostly stable rather than shimmering during motion; the flashlight grip blocks part of the beam in some frames but not others for no clear reason; and the sweep as a whole looks slightly stuttered or segmented rather than perfectly fluid, even though nothing teleports or breaks structurally.
level_4: The three samples stay rigidly side by side without shifting or rotating; the flashlight stays at a constant height and distance behind them; the beam sweeps left-to-right at a steady width and brightness; shadows and highlights shift smoothly together with the beam's position; and there are no dropped frames, cuts, or sudden changes in camera perspective.
level_5: Everything required for a 4 is met, and in addition: the beam's left-to-right advance looks perfectly smooth with no visible stepping or strobing; neither the samples nor the flashlight-holding hand show any visible shake; shadows cast by the samples stretch and shift naturally as the beam moves past them; the quartz crystal facets show no flickering or shimmering as the beam crosses them; and the camera viewpoint shows no drift or wobble relative to the fixed scene.