Domain: Natural Science — Atmospheric Science
Target concept: Flashlight beam passing through clean air versus air containing candle soot particles

Video generation prompt: In a dark room, illuminate the wall using the same flashlight through two parallel transparent boxes; add candle soot to the right box while keeping the left one clean.

Evaluation guide:
(i) Target concept: Light beam propagation through media with differing particulate loadings, demonstrating scattering-induced beam broadening and attenuation.
Minimum mechanism: Light must interact with sub-wavelength carbonaceous particles (soot) to produce forward Mie scattering and absorption; absence of particles must permit direct line-of-sight transmission with minimal perturbation.
(ii)Storyline: [Frame 0–2] Static wide shot reveals dark room, wall, two parallel transparent boxes, and flashlight off-center but aligned to illuminate wall through both boxes. [Frame 3–5] Flashlight activates; beam enters left box → produces sharp, high-contrast spot on wall. Simultaneously, beam enters right box containing visible soot → spot appears immediately larger, lower-contrast, and edge-diffused. [Frame 6–10] Both spots persist stably; soot remains static and non-luminous; no secondary light sources or reflections emerge; viewpoint remains fixed, full boxes and wall regions fully visible throughout.

Manual:
Experimental Procedure
1. Place two identical transparent boxes side-by-side in a dark room.
2. Position a flashlight to shine collimated beam through both boxes simultaneously, targeting a plain wall.
3. Leave left box empty; introduce candle soot into right box.
Observation of Experimental Phenomena
Left wall region: bright, sharply defined circular spot.
Right wall region: dimmer, larger, and diffusely edged spot; soot inside right box appears as dark, non-reflective particulate matter.
Summary of Experimental Principles
Clean air transmits light with minimal scattering → sharp, intense beam spot.
Soot particles scatter and absorb visible light → beam spreads (diffusion) and weakens (attenuation), producing a larger, dimmer, softer spot.

Prompt Grounding rubric:
level_1: No transparent boxes are visible; no flashlight is present; the wall shows no illumination; the setting isn't a dark room; the two boxes are not placed next to each other at all.
level_2: Two containers are present but aren't clearly transparent (e.g., opaque or tinted); or the flashlight is present but isn't aimed at the wall; or the wall is lit without any visible flashlight or box involved; or the two containers are stacked, far apart, or otherwise not arranged side by side.
level_3: Two transparent boxes sit side by side in the dark room; a flashlight is switched on and aimed at the wall through the boxes; the wall shows two illuminated regions roughly lined up with the boxes, but the material in the right box looks like a uniform gray haze rather than visible dark particles.
level_4: All of 3 is met, AND the left box is clearly free of any visible particles while the right box holds visibly dark, uneven clumps of soot; the beam can be traced continuously from the flashlight through each box to its spot on the wall; both wall spots are visible together in the same fixed shot.
level_5: All of 4 is met, AND the soot in the right box looks matte black and clumped/settled rather than like mist, smoke, or liquid droplets; the left box shows no haze or specks at all; each wall spot lines up with the centerline of its own box with no visible offset; no hands, labels, or extra light sources appear anywhere in the shot.

Scientific and Causal Correctness rubric:
level_1: The two wall spots look the same in brightness, size, and sharpness no matter which box the beam passed through; nothing about the soot appears to affect the light at all.
level_2: The wall spots differ, but in the wrong way: e.g., the spot behind the clean box looks dimmer or blurrier than the one behind the soot, or the soot itself looks like it's glowing or reflecting light rather than sitting there as dark, light-blocking material.
level_3: The spot behind the soot-filled box is visibly dimmer, larger, and less sharply bounded than the spot behind the clean box; the soot itself reads as dark, non-luminous material; a viewer can plausibly connect the soot's presence to the dimmer, blurrier spot.
level_4: All of 3 is met, AND the soot-side spot has visibly soft, fuzzy edges while the clean-side spot keeps a crisp boundary; there's no bright glare or reflection inside the soot box that would suggest the dimming comes from something other than the soot; the soot sits still rather than drifting upward the way smoke would.
level_5: All of 4 is met, AND the soot-side spot shows a faint halo of light spreading just beyond its dimmer core, consistent with the beam being scattered sideways by the soot, while the clean-side spot shows no such halo and stays at full brightness; there's no glow visible inside the soot box itself, which would wrongly suggest the soot is lit from within rather than just scattering and blocking the beam.

Spatiotemporal Consistency rubric:
level_1: The boxes or the flashlight jump to a new position or vanish and reappear between shots; the wall spots blink on and off or jump to new locations for no reason; a box's edges warp or break apart into disconnected pieces; the room's overall lighting suddenly changes (e.g., the dark room briefly brightens or dims) with no cause tied to the flashlight or boxes.
level_2: The camera view jumps around, or one box briefly disappears and reappears in a different spot; the flashlight beam wavers erratically; a wall spot changes brightness with no corresponding change in the box or the flashlight.
level_3: The camera holds still and both boxes stay in the same place throughout; the flashlight is held steady; once switched on, both wall spots stay visible continuously; there's no clipping, warping, or perspective distortion; a small amount of frame-to-frame flicker in the spots or a slight shift in how the boxes line up with each other is still acceptable at this level.
level_4: All of 3 is met, AND neither wall spot flickers or changes brightness once it appears; neither the box edges nor the flashlight housing show any visible shaking or wobble across the clip; the beam's path to each spot stays fixed; any shadow the flashlight housing casts keeps the same shape and position relative to the boxes.
level_5: All of 4 is met, AND the two boxes keep the exact same spacing and alignment relative to each other for the whole clip, with no visible drift, zoom, or panning of the frame; if the flashlight casts a shadow, it stays sharp-edged and fully inside the frame without moving on its own; no motion blur appears anywhere despite everything being stationary.