Domain: Humanities and Social Sciences — Geography
Target concept: Fog Types: Advection Fog (Sea Fog, Horizontal Striped) vs. Radiation Fog (Land Fog, Blocky)

Video generation prompt: Side by side, two dynamic images are presented: the left one shows the flowing pattern of advection fog, and the right one shows the flowing pattern of radiation fog.

Evaluation guide:
(i) Target concept: Visual differentiation of fog formation mechanisms via wind-driven transport versus calm, in-place development.
Minimum mechanism: Fog must emerge from and interact with a plausible surface (water for advection, land for radiation); advection fog requires sustained horizontal wind-driven transport of the fog mass, producing elongated, wind-aligned banding as it advances; radiation fog requires quiescent, still-air conditions with fog developing and thickening in place near the ground, without wind organizing it into bands.
(ii)Storyline: Frame 0–2: Both panels begin clear or with only a thin haze near the surface → Frame 3–5: Left panel develops an elongated fog bank with visible lateral streaking that begins advancing across the frame in one consistent direction; right panel forms a shallow, soft-edged patch of fog that thickens and spreads outward from the ground without a dominant travel direction → Frame 6–8: Left fog maintains its band-like structure and steady directional movement; right fog remains diffuse and patchy, continuing to deepen vertically near the surface → Frame 9–10: Both states stabilize with no crossover or merging between panels; viewpoint remains static and centered; observer sees only fog morphology and motion: no labels, arrows, or external cues.

Manual:
Experimental Procedure
1. Display two identical-width vertical panels side by side.
2. Left panel animates an elongated fog bank with lateral streaking that advances steadily in one direction, representing wind-driven transport (advection fog).
3. Right panel animates a shallow, soft-edged fog layer that thickens and spreads from the ground in place, representing calm-condition development (radiation fog), without forming directional streaks.
Observation of Experimental Phenomena
- Left: Continuous, band-like fog advancing steadily in one direction, with visible lateral streaking aligned with the direction of travel.
- Right: Diffuse, patchy fog masses that thicken and pool near the ground, expanding vertically with soft, irregular edges and no directional streaking.
Summary of Experimental Principles
- Advection fog forms when moist air is carried horizontally by wind over a colder surface (e.g., the sea); the sustained wind-driven transport organizes the fog into an elongated, band-like mass that visibly advances across the scene in one direction.
- Radiation fog forms on calm, clear nights over land as the ground radiates heat and cools the air directly above it; without wind to organize or transport it, the fog develops in place as a shallow, soft-edged layer that thickens vertically and pools in low areas near the surface.

Prompt Grounding rubric:
level_1: No side-by-side layout is present, or only one fog type appears; neither the elongated banded fog nor the diffuse patchy fog is visible; both panels show static fog or no fog at all.
level_2: Side-by-side layout is present, but both panels show the same fog appearance (e.g., both banded or both diffuse), or one panel shows an unrelated element (e.g., smoke, cloud, or clear sky) instead of fog; neither panel shows any flowing or animated motion.
level_3: Side-by-side layout shows two visually distinct fog treatments and at least one panel is visibly animated, but the assignment is swapped or blurred, e.g., the left panel shows the diffuse, patchy appearance instead of the elongated banded appearance, or the right panel shows banded streaking instead of diffuse patches.
level_4: Side-by-side layout is correct: the left panel shows an elongated fog mass with visible lateral streaking; the right panel shows a diffuse, soft-edged fog that thickens and spreads near the ground without directional streaking; both panels are visibly animated throughout, though one shows a minor spatial inconsistency such as brief overlap into the other panel or a momentary pause in otherwise continuous animation.
level_5: Side-by-side layout is maintained with a strict, unmoving boundary between panels and a fixed camera viewpoint; the left panel exclusively shows a banded, laterally streaked fog appearance; the right panel exclusively shows a diffuse, soft-edged fog that thickens and pools near the ground with no directional streaking; both panels remain continuously animated for the entire video with no blending, occlusion, or drift across the dividing line.

Scientific and Causal Correctness rubric:
level_1: Neither panel shows fog behavior consistent with either formation mechanism: e.g., both panels show turbulent, rapidly rising vapor resembling steam or smoke rather than the slow, cool development of fog; no causal distinction between wind-driven transport and in-place, calm development is implied by either panel's behavior.
level_2: One panel shows physically implausible fog behavior for its assigned mechanism, e.g., the left (advection) panel shows fog developing and thickening in place with no net displacement across the frame, inconsistent with wind-driven transport, or the right (radiation) panel shows the fog mass visibly translating across the frame as a coherent moving body, inconsistent with formation under calm, still conditions; the other panel is blank or unrelated to either mechanism.
level_3: Both panels show fog-appropriate, non-turbulent development, but the causal signature is only partially correct: e.g., the left panel shows some net translation of the fog mass across the frame but also thickens heavily in place, or the right panel shows mostly in-place thickening but drifts noticeably to one side over the video, implying unaccounted wind; neither panel fully commits to one causal behavior.
level_4: Left panel shows the fog mass clearly and consistently translating across the frame as a coherent body over time, consistent with being carried horizontally by wind; right panel shows the fog developing and thickening essentially in place, with no net translation across the frame, consistent with calm-condition radiative cooling; one panel shows a minor deviation, such as a brief pause in the left fog's translation or a slight net drift in the right fog toward one edge.
level_5: Left panel's fog mass exhibits continuous net translation across the frame for the full duration with no reversal or stalling, correctly implying sustained horizontal wind-driven transport over a surface like the sea; right panel's fog shows no net lateral translation at any point, only in-place thickening and vertical growth near the ground, correctly implying formation under calm, still conditions typical of radiation fog; the two causal behaviors (transported versus stationary-developing) remain distinct and uncontradicted throughout.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breaks: one or both fog panels vanish and reappear, or jump instantly from empty to fully formed between adjacent frames with no visible transition; the video cuts abruptly or inserts a blank frame; the camera viewpoint or the side-by-side split itself changes (e.g., zooms, rotates, or swaps panel positions) mid-video; or the overall lighting flips abruptly (e.g., bright daylight to night or vice versa) with no visible cause.
level_2: Moderate breaks: the boundary between the two panels shifts or resizes noticeably over the course of the video, or fog from one side visibly crosses into the other panel; one panel's fog motion freezes for a noticeable stretch and then jumps forward; the panels' overall brightness changes abruptly partway through with no visible cause, such as one side suddenly darkening while the other stays the same.
level_3: The two panels stay in fixed position and size, and fog motion is continuous in both, but one panel shows an inconsistency such as an unexplained pause in its animation lasting more than a second, or a brief change in overall brightness that isn't mirrored on the other side.
level_4: Both panels keep a fixed size and position with a stable dividing line for the whole video; fog motion in each panel runs smoothly and continuously without pausing or freezing; overall lighting stays even across both panels for the entire duration, with no abrupt shift in brightness on either side; any boundary shimmer or edge softness in the fog is faint enough that it does not distract from tracking each panel's fog shape.
level_5: The two panels remain fixed in position and size for the entire video with a crisp, unmoving dividing line; fog motion in both panels is smooth and continuous from start to finish with no pausing, freezing, or sudden jumps; lighting stays uniform for the whole video with no visible flicker or abrupt change; neither fog panel ever crosses the dividing line, vanishes, or reappears, and no part of the frame shows an unexplained cut or warp.