Domain: Humanities and Social Sciences — Geography
Target concept: Biosphere Vegetation: African Savanna (satellite imagery shows alternating yellow and green patterns) and European Temperate Deciduous Forest (satellite imagery exhibits seasonal variation, appearing yellow-red in spring and autumn).

Video generation prompt: Two images are displayed side by side on the screen: the left image shows a satellite view of the African savanna, and the right image shows a satellite view of a European temperate deciduous forest.

Evaluation guide:
(i) Target concept: Two distinct, independently operating phenological mechanisms shown side by side for comparison, not a converging pair. Left panel: African savanna, where satellite-visible ground/canopy reflectance shifts with the wet/dry rainfall cycle: green when rain-fed grass and scattered trees are actively growing, yellow-tan when the grass has cured and dried out in the dry season. Right panel: European temperate deciduous forest, where reflectance instead shifts with day length and temperature through autumn senescence: green in the growing season, then yellow, orange, and red as chlorophyll breaks down and reveals carotenoid and anthocyanin pigments in autumn, then brown and largely bare through winter before spring green-up. The two panels are driven by different climatic triggers and are not expected to change on the same schedule.
(ii) Storyline: Frame 1-3: static side-by-side view, African savanna (left) in its green, actively-growing state and European deciduous forest (right) in its green summer-canopy state. Frame 4-7: the left panel shifts toward its yellow-tan dry-season appearance while the right panel, on its own timing, shifts through yellow/orange/red autumn foliage; the two shifts are not required to start or finish together. Frame 8-10: hold both altered states side by side so the two distinct color-change patterns (a simple two-state moisture-driven shift versus a multi-stage senescence progression) can be compared directly. Perspective is fixed nadir-view satellite throughout; no camera motion, no oblique angles, and no on-screen text labels or UI overlays; the two land-cover types must be told apart from vegetation texture alone (savanna: open grassland with sparse, scattered tree crowns; deciduous forest: dense, contiguous closed canopy).

Manual:
Experimental Procedure
1. Display two satellite-style images side by side: left = African savanna, right = European temperate deciduous forest.
2. Show the left (savanna) panel shifting between a green, actively-growing wet-season state and a yellow-tan, cured-grass dry-season state, driven by the seasonal rainfall cycle.
3. Independently, show the right (deciduous-forest) panel moving through its own multi-stage progression: green summer canopy, then yellow/orange/red autumn foliage as chlorophyll breaks down and reveals carotenoid and anthocyanin pigments, then brown and largely bare through winter, then green regrowth in spring — driven by day length and temperature rather than rainfall.
4. Do not force the two panels' transitions to start or align on the same frame; they depict two separate biomes governed by two separate seasonal drivers.
Observation of Experimental Phenomena
- Left and right panels keep a fixed side-by-side position throughout.
- The savanna panel's color state (green versus yellow-tan) tracks a simple two-state wet/dry cycle.
- The deciduous-forest panel's color state moves through a multi-stage progression (green, autumn color, bare, spring green) visibly more complex than the savanna's two-state cycle.
- No text labels appear; the two biomes are distinguished only by vegetation texture (open, patchy savanna canopy versus dense, continuous forest canopy) and by the shape of their respective color progressions.
Summary of Experimental Principles
African savanna and European temperate deciduous forest illustrate two distinct phenological mechanisms driven by different climatic controls: the savanna's greenness tracks the wet/dry precipitation cycle, while the deciduous forest's color progression tracks day-length- and temperature-driven senescence (autumn pigment change followed by leaf fall). These are two separate mechanisms shown side by side for comparison, not a synchronized or converging pair.

Prompt Grounding rubric:
level_1: No side-by-side pair of satellite-style images is shown at all: either zero images, only a single image, or images that are not satellite views (ground-level photos, illustrations, or maps with printed labels/legends); neither panel resembles a savanna or a deciduous-forest land-cover pattern.
level_2: Two images appear but are not arranged side by side (stacked vertically, overlapping, or shown one after another instead of together); or they are side by side but at least one panel shows a land-cover type that is neither savanna nor deciduous forest (e.g., desert, urban grid, open water, cropland).
level_3: Two satellite-style images are correctly arranged side by side; the left panel reads as open grassland with scattered tree crowns (savanna-like) and the right panel reads as a denser tree canopy (forest-like), but the contrast between the two textures is too weak, blurry, or similar for a viewer to reliably tell savanna from deciduous forest by pattern alone.
level_4: Two satellite-style images are arranged side by side with equal framing and scale; the left panel is clearly identifiable as open, patchy savanna canopy and the right panel as a dense, continuous deciduous-forest canopy, distinguishable by vegetation texture alone with no text labels; however, panel sizing or position is slightly uneven, or one panel briefly resizes relative to the other.
level_5: Two satellite-style images sit side by side with matched size, aspect ratio, and nadir framing for the entire duration; the left panel is unmistakably open, patchy savanna texture and the right panel is unmistakably dense, continuous deciduous-forest texture, with no text labels, legends, or UI overlays anywhere in the shot; the spatial arrangement and land-cover identities match the setup in posted_prompt throughout.

Scientific and Causal Correctness rubric:
level_1: Neither panel shows a scientifically plausible vegetation color state: the savanna panel never shows either its green (wet-season) or yellow-tan (dry-season) state, or the forest panel never shows a plausible green or autumn-toned state; or a panel is rendered in a color impossible for live or senescent vegetation (blue, black, deep purple canopy).
level_2: One panel shows a plausible starting color, but any change shown contradicts its own mechanism, e.g., the savanna turns yellow-tan with no dry-season cue at all, or the forest jumps directly from green to bare brown with no yellow/orange/red autumn stage in between; or the two panels are forced to change in obvious lockstep, implying one shared trigger, even though rainfall-driven savanna cycling and photoperiod-driven forest senescence are different mechanisms.
level_3: The savanna panel plausibly shows a green-to-yellow-tan (or yellow-tan-to-green) shift, and the forest panel plausibly shows some progression through green, autumn coloring, and/or bare-canopy states; however, the forest's progression skips a stage it should show (for example, jumping straight from green to bare brown with no visible yellow/orange/red intermediate), understating the senescence sequence.
level_4: The savanna panel shows a convincing green (wet season) to yellow-tan (dry season) reflectance shift, and the forest panel independently shows the full green to yellow/orange/red autumn-coloring to brown/bare-canopy progression, each mechanism visually distinct in its driver and palette; however, the two panels' transitions still appear to begin on the same frame, understating that they are independent, unsynchronized processes.
level_5: The savanna panel shows a convincing, correctly directioned green-to-yellow-tan wet/dry cycle, and the forest panel independently shows a convincing green-to-autumn-color-to-bare progression, with each panel's transition beginning and unfolding on its own schedule with no forced synchrony between them; the savanna's dry-season tone reads as warm ochre/tan cured grass, the forest's autumn tones read as warm yellow/orange/red foliage rather than the savanna's palette, and the forest's dormant tone reads as brown/gray twig-and-bark rather than any implausible hue.

Spatiotemporal Consistency rubric:
level_1: A catastrophic break occurs in the shot: one or both satellite panels vanish, get replaced by an unrelated scene, or swap left/right positions mid-sequence; or the illumination across the whole frame reverses (areas that were brightly lit go dark and vice versa) with no gradual, explainable cause; or a panel's image suddenly jumps to a different scale, rotation, or crop with no visible motion explaining the change, or the frame's contents visibly warp or tear.
level_2: The side-by-side layout is unstable: the two panels drift apart, overlap, or resize independently of one another over the course of the shot; or the overall brightness or contrast of the scene changes noticeably partway through with no visible cause; or the edge of a panel visibly warps or distorts.
level_3: Both panels keep a fixed size, position, and spacing relative to each other for the whole shot, with no drifting, overlapping, or warping; however, within at least one panel its own color change renders as a hard, instantaneous swap from one state to the other rather than a visible progression, breaking continuity within that panel.
level_4: Both panels keep a fixed size, position, and spacing throughout; each panel's own color change renders as a visible, gradual progression through its intermediate states (the savanna moving through in-between green/tan tones; the forest moving through its green, autumn-color, and bare-canopy stages) rather than an instantaneous swap; however, a brief, minor flicker or momentary double image appears in one panel during its transition without disrupting recognition of either land-cover type.
level_5: Both panels keep an identical fixed size, position, and spacing for the entire shot; each panel's own color progression plays out as one smooth, continuous, flicker-free sequence through its intermediate states; overall scene lighting and framing stay constant throughout; neither panel ever pops, jumps, or ghosts, and no border or edge of either panel moves or deforms at any point.