Domain: Natural Science — Physics
Target concept: Replace red, green, and blue optical filters in turn in front of the camera filming the same sea.

Video generation prompt: A camera mounted on a tripod captures the same sea surface, with a person sequentially placing red, green, and blue optical filters in front of the lens.

Evaluation guide:
(i) Target concept: Subtractive color filtering via spectral bandpass restriction.
Minimum mechanism: Light from the sea surface contains broadband visible wavelengths; each filter absorbs non-matching wavelengths and transmits only its designated band; camera sensor records only transmitted light, resulting in monochromatic-dominant image per filter.
(ii)Storyline: [Frame 0–~3s] Stable wide shot of sea surface through unfiltered lens → [t+0.5s] Person"s hand enters from bottom edge, places red filter flush against lens → sea instantly shifts to red-dominant appearance → [t+1.5s] hand removes red filter → sea returns to natural color → [t+2.0s] hand places green filter → sea shifts to green-dominant appearance → [t+3.0s] hand removes green filter → sea returns → [t+3.5s] hand places blue filter → sea shifts to blue-dominant appearance; all transitions occur within fixed camera frame, no viewpoint change, no lighting intervention, no post-processing color shift.

Manual:
Experimental Procedure
1. Mount camera on tripod, point steadily at open sea surface.
2. Person places red optical filter fully in front of lens, holds 1 second.
3. Person removes red filter, places green optical filter fully in front of lens, holds 1 second.
4. Person removes green filter, places blue optical filter fully in front of lens, holds 1 second.
Observation of Experimental Phenomena
Sea surface appears dominantly red-tinted under red filter, green-tinted under green filter, and blue-tinted under blue filter — with no other hues dominating in each condition.
Summary of Experimental Principles
Red, green, and blue optical filters selectively transmit only their respective wavelength bands; when placed before a camera lens, they restrict incoming light to those bands, altering the perceived color of the scene according to subtractive color filtering.

Prompt Grounding rubric:
level_1: No tripod-mounted camera or sea-surface shot appears, no person is shown, and none of the red, green, or blue filters ever appear in front of the lens; nothing in the video matches the described filter-placement demonstration.
level_2: A camera and a body of open water are shown, but no person appears to handle any filter; or a person appears yet never brings a filter in front of the lens; or only a single filter object ever appears, with no second or third filter introduced afterward.
level_3: A tripod-mounted camera keeps a sea-surface shot in frame; a person's hand enters the shot and places three separate colored filter disks in front of the lens one after another; three distinct filter objects appear, but their colors are not clearly identifiable as red, green, and blue (e.g., washed out, or two of them look like the same hue), or the placements overlap in time so the red-then-green-then-blue order can't be told apart.
level_4: Beyond that: each filter is unmistakably red, green, or blue by eye, and the three placements happen strictly one after another, never two filters in the shot together; one small flaw remains, such as the hand briefly blocking the whole lens, a filter held at an angle that leaves part of its edge out of frame, or a moment where the sea view is interrupted by hand motion.
level_5: Beyond that: the same person's hand appears at the same entry position each time; the red filter is placed fully over the lens first and removed, then the green filter is placed and removed, then the blue filter is placed, with each filter's disk fully covering the visible lens opening and its edges staying inside frame every time; no filter is ever left partially covering the lens, no unrelated object enters the shot, and there is no camera cut or reframing between the three placements.

Scientific and Causal Correctness rubric:
level_1: The sea's appearance never changes no matter which filter is held up in front of the lens, or a color shift appears that is physically backwards for a filter (e.g., the red filter yields a cyan/blue-tinted sea, or the blue filter yields a yellow/orange-tinted sea).
level_2: The sea's tint does change as filters are swapped, but the resulting color doesn't track which filter is actually in front of the lens: for example, the same reddish tint appears under both the red and the green filter, or a blue tint appears while the red filter is still visibly in place.
level_3: Under the red filter the sea looks noticeably redder/warmer than its natural color, under the green filter noticeably greener, and under the blue filter noticeably bluer (the three tints are distinguishable from each other and each roughly matches its filter), but at least one of the three looks faint, mixed with a wrong hue (e.g., the 'green' result reads yellow-green), or briefly washed out as if by automatic white-balance correction.
level_4: Beyond that: all three filters produce a tint a viewer can immediately match to the correct filter color (red stays red-dominant rather than orange/pink, green stays green-dominant rather than yellow/teal, blue stays blue-dominant rather than purple/teal), with none of the three reversed or blended with a wrong hue; only one small deviation remains, such as a brief neutral-looking moment right as a filter is swapped in or out.
level_5: Each filter's tint is dominated by its own color and clearly distinguishable from the other two (the red-filter shot reads unambiguously red, the green-filter shot unambiguously green, the blue-filter shot unambiguously blue); the three tints never blend into or repeat each other; each tint appears only while its matching filter is actually in front of the lens and the sea returns to its natural color the moment the filter is removed; and there is no visible auto white-balance or exposure correction fighting against the filter's tint.

Spatiotemporal Consistency rubric:
level_1: The camera's view of the sea jumps or reframes abruptly between shots; the horizon or wave pattern visibly warps or stretches; the person's hand or a filter appears or vanishes without ever moving into or out of frame; the lighting changes abruptly with no cause (e.g., a sudden flash, strobe, or the whole scene snapping brighter or darker), including a highlight or shadow on the water jumping to a new spot with no change in the light source to explain it.
level_2: The camera visibly wobbles or drifts instead of holding still on its tripod; the hand enters the frame from a different side each time a filter is placed; one filter appears much larger or closer to the lens than the other two with no explanation; or the overall brightness of the shot jumps noticeably right as a filter is swapped, unconnected to the filter's own tint.
level_3: The camera holds the same framing of the sea throughout; the hand enters from the same side of frame for all three filter placements; the three filters are held at roughly the same distance and angle from the lens; the water's horizon and wave motion look continuous, apart from one brief hiccup, such as the hand's motion visibly hesitating for a moment, or a fleeting glare on the lens that briefly washes out the view of the sea.
level_4: Beyond that: the hand approaches the lens the same way (same speed, same path) for all three filters, with no hesitation or stray glare occurring at all; the only flaw left is minor and non-recurring, such as a moment of soft motion blur on the hand during one placement that doesn't affect the sea shot itself.
level_5: The camera's position, framing, and zoom never change across the whole sequence; the sea's horizon and wave pattern stay continuous with no warping; the hand follows the same path, speed, and timing placing all three filters; each filter is brought fully over the lens opening with the same coverage and orientation as the other two; the sea's highlights and reflections keep the same position and brightness throughout, changing only in tint as each filter goes on; there is no camera shake, no jump cut, and no mismatched depth between the three placements.