Domain: Humanities and Social Sciences — Geography
Target concept: Atmospheric Scattering: Clear sky = Blue (scattering of shortwave blue light), sunrise/sunset = Orange-red (less scattering of longwave red light). Labeled as Atmospheric Scattering, unique sky colors are associated.

Video generation prompt: The image focuses on the sky, illustrating the entire process from sunrise to a clear sky, and then to sunset, showcasing the changes in sky color under clear weather conditions.

Evaluation guide:
(i) Target concept: Temporal chromatic evolution of clear-sky appearance due to solar zenith angle-driven Rayleigh scattering.
Minimum mechanism: A static, cloudless, aerosol-free atmosphere illuminated by a distant collimated light source (sun); observer at fixed location on flat terrain with unobstructed horizon-to-horizon sky view; no artificial lighting or post-processing color grading.
(ii)Storyline: [Phase 1] Video begins with full-frame orange-red sky, consistent with low solar elevation (sun near horizon), maximum path length → dominant longwave transmission. [Phase 2] Sky transitions continuously and irreversibly to uniform blue as the sun climbs well clear of the horizon, shortening the atmospheric path length so shortwave (blue) scattering dominates over longwave transmission. [Phase 3] Sky transitions continuously back to orange-red, matching Phase 1 hue and saturation, confirming symmetric low-elevation geometry (sunset). All phases maintain fixed viewpoint, no occlusion, no parallax, no secondary light sources; visibility constrained solely to sky dome: no sun disk, no horizon line, no terrain features.

Manual:
Experimental Procedure
1. Record a fixed-view, full-frame shot of the sky over a clear day.
2. Capture the sky at sunrise (orange-red), then as the sun rises higher (blue), then at sunset (orange-red again).
Observation of Experimental Phenomena
- Start: Uniform orange-red sky
- Middle: Uniform blue sky
- End: Uniform orange-red sky identical to start
Summary of Experimental Principles
Atmospheric Scattering: Shorter blue wavelengths scatter more in overhead sunlight → clear sky appears blue. At sunrise/sunset, sunlight passes through more atmosphere → longer red/orange wavelengths dominate → sky appears orange-red.

Prompt Grounding rubric:
level_1: No sky-focused sequence is shown: the video does not depict the sky at all, shows only ground-level objects with no sky visible, or shows a single static sky color with no color change over time.
level_2: The sky is shown but the sunrise → clear-sky → sunset progression is incomplete or disordered: only one of the three color states (sunrise orange-red, midday blue, sunset orange-red) ever appears; or two states appear in the wrong order; or the sky view is broken up by unrelated cutaway scenes with no continuity.
level_3: The sky is the sole visual focus for the whole video; three distinct color states appear in this order: orange-red, then blue, then orange-red again; no buildings, trees, sun disk, or other objects dominate or interrupt the view of the sky.
level_4: All 3-point conditions are satisfied AND the three states follow the sunrise → midday → sunset order while the sky fills the frame as the only visual subject; no non-sky element ever enters the frame; the color transitions between the three states run continuously, without a hard cut between them.
level_5: All 4-point conditions are satisfied AND the sky fills the entire frame for the full duration; each of the three states reads as a visually uniform color field, without clouds, streaks, or other texture breaking its uniformity; the first and last orange-red segments look like matching color states; the blue segment sits centered in time and lasts noticeably longer on screen than either orange-red segment; no flicker, cut, or sudden compositional change occurs at any point.

Scientific and Causal Correctness rubric:
level_1: Sky colors contradict atmospheric scattering: e.g., the sky appears blue during the sunrise or sunset segments, or appears orange-red at the overhead-sun segment, or all three segments share the same color; there is no visible link between the implied solar position and the sky's color.
level_2: Only one scientifically valid sky color appears throughout (e.g., blue alone with no orange-red segments), or two colors appear but are mismatched to their phase (e.g., an orange-red sky shown as the overhead 'clear sky' segment); there is no clear sequence tying color to solar position.
level_3: Three color states appear in the correct order and association: orange-red at the start (sunrise), blue in the middle (sun well above the horizon), orange-red again at the end (sunset); the two orange-red segments are close in hue to each other and clearly distinguishable in hue from the blue segment.
level_4: All three states follow atmospheric scattering theory: the orange-red hue appears only near the two ends of the sequence, the blue hue occupies the whole middle segment, and no unrelated intermediate hues (purple, pink, yellow) appear between them; the color progresses monotonically toward blue and then back toward orange-red, without reversing or oscillating partway through a transition.
level_5: The two orange-red segments match each other closely in hue and saturation; the blue segment reads as a clean sky blue with no visible green or violet tint; the sky shows no patchy discoloration, streaking, or localized color spots breaking its uniformity; no visible color bleed or halo appears at the boundary of the sky region; each color change (orange-red→blue and blue→orange-red) unfolds as one smooth, gradual hue shift across many intermediate shades, matching the continuous transition described for this scene, rather than an abrupt jump between two flat colors.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal rupture: the sky's viewpoint jumps between very different framings (e.g., tilted to overhead to fisheye), or the video cuts abruptly with black frames, flashes, or freezes; the lighting direction or shadow pattern is inconsistent with a single fixed outdoor daytime viewpoint.
level_2: The viewpoint noticeably shifts (zoom, pan, or rotation) at some point, or the brightness changes inconsistently (e.g., a sudden brightness spike with no accompanying color shift); the sky's texture or graininess changes abruptly between the three color segments.
level_3: The viewpoint stays fixed throughout, with no camera motion, no perspective shift, and no change in framing scale; the illumination looks globally consistent, without localized bright or dark patches appearing on the sky; the sky's surface looks uniformly continuous in every frame.
level_4: All 3-point conditions are satisfied AND there is no visible inter-frame jitter or strobing in the sky region; no blocky compression artifacts disrupt the sky's uniform color; no frame appears frozen, duplicated, or skipped.
level_5: All 4-point conditions are satisfied AND the sky region shows no visible shift, drift, or reframing across the entire sequence; every frame shows a coherent, physically plausible sky color; there is no motion blur, since nothing in the frame should be moving; there are no visible depth cues (parallax, layered haze) that would contradict a flat, static sky dome.