Domain: Natural Science — Physics
Target concept: Pyrolytic graphite suspended above a neodymium-iron-boron magnet array

Video generation prompt: On the table, small neodymium cube magnets, each marked with a small colored dot on one face, are arranged in a checkerboard pattern so that neighboring magnets show the dot facing up or down in alternation, and then a thin square piece of pyrolytic graphite is released above the array.

Evaluation guide:
(i) Target concept: Stable diamagnetic levitation of pyrolytic graphite over a periodic magnetic field gradient generated by alternating-pole permanent magnets.
Minimum mechanism: Graphite must be intrinsically diamagnetic (not ferromagnetic or paramagnetic); magnet array must produce a strong, spatially alternating field (checkerboard N-S-N-S); no external stabilization (e.g., feedback, enclosure, or air flow) permitted.
(ii)Storyline: Frame 1–2: Static shot showing checkerboard magnet array on table, each magnet marked with a small colored dot indicating pole orientation, alternating up/down between neighbors. Frame 3–4: Thin square graphite held centered above array. Frame 5–6: Graphite released from rest (visible onset of downward motion). Frame 7–10: Graphite decelerates and settles into motionless hover (no contact, no drift, no oscillation) fully within array's vertical projection. Perspective: Fixed frontal or slightly elevated viewpoint; full array and entire graphite piece always fully visible; no occlusion; lighting consistent and directional (e.g., top-left soft key light with matching shadow).

Manual:
Experimental Procedure
1. Place small identical neodymium cube magnets, each pre-marked with a small colored dot on one pole face, on a flat table in a checkerboard pattern so adjacent magnets alternate dot-up with dot-down (opposite poles facing up).
2. Hold a thin, square piece of pyrolytic graphite horizontally, centered above the array.
3. Release it gently from rest — no push or throw.
Observation of Experimental Phenomena
The graphite hovers stably, motionlessly, and without contact above the magnet array — maintaining its square shape and matte dark-gray appearance — at a fixed height greater than magnet thickness.
Summary of Experimental Principles
Pyrolytic graphite is diamagnetic; when placed above a spatially varying magnetic field (produced by alternating-pole neodymium magnet array), it experiences repulsive force sufficient to levitate against gravity.

Prompt Grounding rubric:
level_1: No small cube magnets are visible on the table, the magnets are not arranged in any grid/checkerboard layout, no thin square graphite piece is visible, the tabletop itself is absent, or the graphite piece is depicted as an obviously different material (shiny metal or clear plastic) instead of a matte dark gray/black square.
level_2: Small cube magnets and a thin square dark object both appear, but at least one key detail is wrong: the magnets are not laid out in a grid pattern, none of the magnets shows any colored pole-marking so alternating orientation cannot be seen, the graphite piece is not square, or the graphite is never shown being released (no drop action or downward-motion onset).
level_3: Small cube magnets arranged in a grid/checkerboard layout sit on a flat table, each magnet showing a visible colored pole-marking dot, and a thin square pyrolytic graphite piece is visibly released (shown mid-air with the onset of downward motion) above the array; no object is misidentified and no core object is missing.
level_4: The magnet grid, pole-markings, and graphite release described for score 3 are all present, and further: the colored pole-marking dots visibly alternate orientation (up/down) between neighboring magnets in both row and column directions, the graphite is centered above the array at the moment of release, and the table is flat and horizontal with the full array and graphite unobstructed during release.
level_5: The alternating pole-marking, centered release, and unobstructed table described for score 4 are all present, and further: the up/down marking alternation is unambiguous for every adjacent magnet pair (no two neighboring magnets show the same marking orientation), the graphite stays within the array's footprint throughout its entire visible descent, and no extraneous objects (hands, tools, labels) remain in frame after the release action completes.

Scientific and Causal Correctness rubric:
level_1: Phenomenon contradicts physics: the graphite visibly touches or rests on the magnets, falls straight through the array to the table, sticks to a magnet's surface, accelerates upward away from the array, or visibly changes color or shape while falling.
level_2: The graphite fails to reach a stable hover: it contacts the table or a magnet, bounces, slides sideways off the array, or wanders in a non-vertical path; or its matte dark-gray/black color turns shiny or metallic at any point; or the graphite appears already floating without ever having been shown released from a held position.
level_3: After release, the graphite comes to hover above the magnet array with no visible contact or support, keeps its thin square shape and matte dark-gray/black color throughout, and its hovering position stays above the checkerboard region rather than drifting off to one side.
level_4: The stable, unsupported hover and unchanged shape/color described for score 3 both hold, and further: the graphite settles at one fixed height with no continued upward or downward creep, it does not slide sideways or spin while hovering, and the hover height visibly clears the tops of the magnets by roughly the graphite's own thickness (staying below about twice the magnet height) rather than resting on them or floating far above.
level_5: The fixed-height, non-sliding hover described for score 4 holds, and further: the graphite shows no visible vibration, tilting, or wobble once settled, it stays centered over the middle of the checkerboard array rather than drifting toward one edge, and there is no momentary dip toward the magnets or flicker of instability at any point after settling.

Spatiotemporal Consistency rubric:
level_1: the graphite piece is missing from a frame and then abruptly shows up at a different height or offset position with no connecting motion, the magnet grid's layout or spacing changes between frames, the tabletop surface warps or vanishes, the graphite's height above the array jumps discontinuously rather than changing gradually, or the scene's lighting and shadow direction shifts abruptly between frames with no cause (e.g., the key light flips side or brightness changes with no source).
level_2: The graphite's downward or hovering motion shows noticeably jerky, judder-like jumps from one frame to the next rather than smooth continuous movement; the magnets flicker in and out of visibility or their pole-marking dots blur or swap inconsistently; the shadow cast by the graphite or magnets shifts direction inconsistently even though nothing about the light source changes; or the graphite's edges visibly stretch or squash as it moves.
level_3: The graphite descends and settles into hover directly above the same patch of the checkerboard array throughout: its horizontal position over the grid does not shift sideways; the magnet array itself does not relocate, rotate, or change its layout at any point; the graphite's cast shadow tracks roughly beneath wherever the graphite currently is.
level_4: The stable overhead position and unmoving magnet array described for score 3 both hold, and further: the graphite's downward motion before settling is smooth rather than stepped or stalling partway, the magnet array shows no drift or rotation once placed on the table, and the tabletop surface shows no warping or flicker beneath or around the array.
level_5: The smooth descent and stationary array described for score 4 hold, and further: the graphite's motion traces a physically plausible slow-down into a steady hover with no bounce or overshoot past its final resting height, the graphite's outline stays a consistent size and sharpness throughout (no unexplained growing/shrinking), and no ghosting, doubling, or blurring artifact appears on the graphite or magnets at any point.