Domain: Natural Science — Morphology
Target concept: Sponge model with finger-like projections absorbing colored water, compared to a flat sponge

Video generation prompt: Place two sponges of the same size side by side on a tray: the sponge on the left has finger-like projections, while the sponge on the right is flat. Equal amounts of colored water are poured simultaneously onto both sponges.

Evaluation guide:
(i) Target concept: Morphological advantage of increased surface area via structural protrusions for enhanced fluid absorption via capillary action.
Minimum mechanism: Sponge material must be hydrophilic and porous; finger-like projections must be physically connected extensions (not detached appendages) that provide additional capillary pathways; water must be Newtonian, non-viscous, and dyed for visibility; gravity and surface tension must govern flow without external pumping.
(ii)Storyline: Frame 0–1: Static wide shot showing two sponges side-by-side on tray, clearly differentiated by shape (projections vs flat). Frame 2–3: Identical water streams descend synchronously from same height, striking each sponge center. Frame 4–8: Absorption initiates simultaneously; color visibly advances deeper into left sponge projections than into right sponge surface; contrast in penetration depth increases over time. Frame 9–10: Final state shows greater color saturation and depth in left sponge, with minimal residual surface water versus pooling on right sponge. Perspective: Fixed frontal view, full sponges and tray in frame, no occlusion, consistent lighting.

Manual:
Experimental Procedure
1. Place two sponges of identical size side-by-side on a flat tray: left sponge has distinct finger-like projections, right sponge is completely flat.
2. Simultaneously pour equal amounts of identically colored water onto the center of each sponge.
Observation of Experimental Phenomena
Water is absorbed faster and deeper into the finger-like sponge than into the flat sponge; color penetrates visibly farther into the projections compared to the uniform surface.
Summary of Experimental Principles
Finger-like projections increase surface area and capillary channels, enhancing absorption capacity compared to a flat surface — a key morphological adaptation in porous materials.

Prompt Grounding rubric:
level_1: Neither sponge appears in frame, or only one of the two sponges is shown; the two sponges are not on the same tray together; colored water is never poured onto either sponge, or it's poured onto only one; both sponges look the same shape (no visible contrast between finger-like projections and a flat surface).
level_2: Both sponges are on the tray, but their spatial relationship is wrong (stacked, overlapping, or with a large gap instead of sitting adjacent); or the two sponges still look alike instead of one having finger-like projections and the other being flat; or the colored water is poured onto one sponge noticeably before the other with a visible gap in timing; or the water lands beside a sponge rather than on top of it.
level_3: Two similarly sized sponges sit next to each other on the tray; the left sponge clearly has finger-like projections while the right sponge is flat; equal-looking amounts of colored water are poured onto each sponge; the pour happens in one continuous shot with no cut, and the water is visibly landing on both sponges.
level_4: All conditions for score 3 are met, and the finger-like projections are unmistakably raised, finger-shaped protrusions rather than just a bumpy or textured surface; the flat sponge shows no protrusions at all; the water poured onto each sponge is the same color; the tray sits level and fully in view; nothing blocks the view of either sponge or where the water lands.
level_5: All conditions for score 4 are met, and the finger-like projections are similar in height and spacing across the whole left sponge; the flat sponge's top surface looks even with no bumps or dips; both water pours start from about the same height above their sponge; the two streams reach the center of each sponge at essentially the same moment; no blur hides the shape difference between the sponges or the moment the water first touches them.

Scientific and Causal Correctness rubric:
level_1: Neither sponge visibly absorbs the water; or both sponges absorb it in the same way with no visible difference; or the colored water spreads out flat across a sponge's surface rather than sinking in; or the color disappears entirely (e.g., runs off the tray edge) instead of soaking into either sponge; or color appears to sink into a sponge before the water has touched it.
level_2: Only one sponge shows any absorption at all, or the two sponges start absorbing at clearly different times after contact; or water visibly pools on top of one sponge with no sign of soaking in while the other absorbs normally; or the flat sponge keeps a visible pool of color on its surface while the finger-like sponge's color drains away with no visible trace of soaking into the material anywhere — leaving it unclear whether the projected sponge actually absorbed the water or the color just ran off it.
level_3: Both sponges visibly draw the colored water in (the color recedes into the sponge material rather than sitting on top); both start absorbing at roughly the same moment after contact; the finger-like (left) sponge shows the color sinking in faster or deeper than the flat (right) sponge; this difference in absorption is clearly visible by the end of the video.
level_4: All conditions for score 3 are met, and the absorption in both sponges progresses smoothly with no freezing or sudden jumps; the color stays within each sponge's boundaries with no leaking beyond its edges; neither sponge shows the color fading or turning transparent for reasons unrelated to being soaked in; in both sponges, the color front visibly moves inward from where the water first touched down.
level_5: All conditions for score 4 are met, and at every comparable moment after contact the color has visibly penetrated deeper into the finger-like sponge than into the flat one; no puddle of water remains sitting on the finger-like sponge's surface while one still sits on the flat sponge; the color inside the finger-like sponge stays visibly richer/more saturated than inside the flat sponge throughout; the color never fades back out or spreads sideways in a way that looks inconsistent with soaking in.

Spatiotemporal Consistency rubric:
level_1: A sponge vanishes from one frame and reappears in another, or suddenly changes size or shape with no motion causing it; the tray is missing in one frame and back in the next; the lighting swings from bright to dark (or the reverse) with no transition; a sponge's edge appears to crack, warp, or bend unnaturally; the falling water stream jumps straight from off-screen onto a sponge with no visible path.
level_2: A sponge shifts to a different spot on the tray with no visible motion getting it there; the point the water stream falls from jumps sideways between frames; the tray's tilt changes without any visible tipping motion; the number of finger-like projections changes partway through (e.g., three fingers become four); the flat sponge briefly grows a bump or ridge that wasn't there before.
level_3: Both sponges stay in the same place relative to each other and the tray throughout; neither sponge disappears or pops into existence mid-video; the lighting stays even in both brightness and direction; the pouring and absorption play out smoothly with no stuttering, repeated frames, or gaps in the motion; each sponge's shape stays the same the whole time.
level_4: All conditions for score 3 are met, and the camera holds one fixed angle with no panning, tilting, or zooming; both sponges remain framed consistently with no sliding relative to one another; shadows cast by the sponges and the falling water line up with a single consistent light source; the water visibly deforms as it hits each sponge rather than appearing to pass through it.
level_5: All conditions for score 4 are met, and the surface texture of each sponge stays steady with no shimmering or warping; each falling water stream keeps a coherent, cylindrical shape as it falls rather than breaking apart oddly; the boundary of absorbed color advances smoothly rather than in visible jumps or flickers; the outline of each sponge stays sharp and steady from frame to frame with no visible jitter or edge flicker.