Domain: Engineering — Communications Engineering
Target concept: Occlusion Attenuation

Video generation prompt: A wireless transmitter is placed facing a receiver linked to an LED. Initially, the LED is bright. The number of iron plates positioned between the two is gradually increased (from 0 to 3), and the brightness of the receiver is observed.

Evaluation guide:
(i) Target concept: Signal attenuation via conductive/magnetic occlusion in RF propagation.
Minimum mechanism: Transmitter emits RF energy; receiver converts received RF power into current driving LED; iron plates reflect/absorb RF energy proportional to thickness and count; reduced incident power at receiver causes proportional reduction in LED luminance (non-linear but monotonic within range).
(ii)Storyline: Frame 0–t₁: Static wide shot showing aligned transmitter, open path, receiver with bright LED. t₁–t₂: Hand places first iron plate centrally in path; LED dims. t₂–t₃: Second plate added adjacent/stacked; LED dims further. t₃–t₄: Third plate added; LED dimmest but still lit. All phases viewed from fixed frontal perspective; no occlusion of LED itself by plates or hands; LED remains fully visible and centered in frame throughout.

Manual:
Experimental Procedure
1. Place wireless transmitter facing receiver with LED visibly lit.
2. Add iron plates one-by-one between them (0 → 1 → 2 → 3).
3. Observe LED brightness after each addition.
Observation of Experimental Phenomena
LED brightness decreases progressively with each added iron plate; remains lit but visibly dimmer at 3 plates vs. 0 plates.
Summary of Experimental Principles
Iron plates attenuate radio-frequency signal transmission due to conductivity and magnetic permeability; increased occlusion reduces received power, lowering LED brightness — demonstrating occlusion attenuation in wireless communications.

Prompt Grounding rubric:
level_1: None of the required objects appear at any point: no wireless transmitter, no receiver unit, no LED, and no iron plates are shown in the scene.
level_2: Only some of the required objects appear together (for example the transmitter and receiver but no LED, or plates without a lit LED), or an object is swapped for something else (a battery standing in for the transmitter, a plain light bulb standing in for the LED, aluminum sheets standing in for iron plates), or the iron-plate count never changes across the whole clip (always 0, or always 3, or a non-whole count like a bent partial plate).
level_3: The wireless transmitter, receiver, LED, and iron plates are all present and clearly identifiable as such in the same shot; the plate count is shown at two or more distinct amounts (say 0 then 1, or 1 then 2), but the full progression from 0 up through 3 is not shown, or plates appear or vanish between shots without a visible hand placing them.
level_4: Everything required for a 3 holds, and in addition: the plate count is shown at three distinct amounts (for example 0, 1, and 2, or 0, 1, and 3) with each amount clearly distinguishable by eye; a hand or tool visibly places each plate; the transmitter and receiver stay in the same spot; the LED stays visible in the same location throughout.
level_5: Everything required for a 4 holds, and in addition: all four plate counts appear in order (0, then 1, then 2, then 3), each one fully settled into view before the next plate is added; every plate is carried into place by a visible hand or tool motion, with no plate appearing out of nowhere or being duplicated; the transmitter, receiver, and LED keep the same position and orientation across every state; nothing ever blocks the LED from view.

Scientific and Causal Correctness rubric:
level_1: The LED's brightness never changes across the whole sequence regardless of how many iron plates are added, or it changes in the wrong direction (getting brighter as more plates go in), either way contradicting the basic idea that stacking conductive plates should reduce the signal reaching the receiver.
level_2: The LED's brightness does change, but not in step with the plate count: for instance it varies randomly, dims only when a plate is taken away, or dims after the first addition and then stays flat; or the LED changes color (say from white to blue) or shuts off completely instead of gradually dimming; or its brightness shifts before a plate is actually placed or after it is removed.
level_3: The LED gets visibly dimmer across at least two of the plate-count changes (say 0 to 1, then 1 to 2); it is clearly dimmer with more plates present; but at least one step doesn't follow this pattern (for example 2 to 3 shows no further dimming), or the brightness bounces back partway through without a plate being removed.
level_4: The LED gets dimmer at every single plate-count transition, with no step failing to dim further and no brightness recovering along the way; it stays lit (never goes fully dark) at every plate count up to three; there is no unexpected color shift, flicker, or strobing; each dimming step is gradual enough to be seen clearly.
level_5: The LED dims by a clear, noticeable amount at every single plate addition (0 to 1, 1 to 2, 2 to 3); each dimmer level holds steady until the next plate goes in; the LED's hue stays the same throughout, only its brightness changes; and brightness only ever shifts right after a new plate is fully placed, never at any other moment.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breaks: the transmitter, receiver, or LED blinks out of view and then comes back; the whole scene's lighting jumps between fully shadowed and fully lit with no transition; the receiver housing appears to split into disconnected parts; or the video cuts abruptly between unrelated shots of the setup.
level_2: Moderate problems: the transmitter or receiver shifts to a new position or angle with no visible cause; the LED flickers on and off rather than dimming smoothly; the shadows cast by the objects don't match where the light in the scene is coming from; or a hand's motion while placing a plate is jerky, skipping ahead in noticeable jumps.
level_3: Minor but noticeable issues: the LED's position drifts slightly across the different plate-count states; the room's background brightness shifts a little while the LED area itself stays steady; one plate appears already in its final position without a visible motion of it being placed; nothing disappears outright and no part of the setup breaks apart.
level_4: Everything required for a 3 holds, and in addition: the transmitter, receiver, and LED stay in the same spot and orientation across every state; each iron plate is carried into place with a smooth, continuous hand or tool motion rather than snapping into position; the LED's brightness changes smoothly rather than flickering; shadows and highlights on the setup stay consistent with a single, unmoving light source.
level_5: Everything required for a 4 holds, and in addition: the transmitter, receiver, LED, and the surface they sit on show no detectable drift or repositioning across the whole clip; each plate's placement motion is fully visible and unhurried, with no sudden jump in speed and without motion blur so heavy the plate becomes unrecognizable; the LED's dimming after each new plate plays out gradually rather than in one abrupt step; the overall brightness and color of the scene stay even from one moment to the next with no unexplained flicker anywhere in frame.