Domain: Engineering — Electrical Engineering
Target concept: Pressing any key will light up the LED, and the LED will turn off when all keys are released. The brightness of the LED remains unchanged when both keys are pressed simultaneously.

Video generation prompt: Wire two buttons and an LED together on a breadboard (with two input terminals) so that each button serves as an input and the LED serves as the output; first press each button individually once, then press both buttons simultaneously, and record the LED's lighting state.

Evaluation guide:
(i) Target concept: Binary digital logic realization via physical circuit where output is high (LED on) if at least one input is high (button pressed); minimum mechanism: closed-switch = logical 1, open-switch = logical 0, LED anode tied to Vcc via resistor, cathodes tied to inputs through pull-down configuration (or equivalent active-low OR implementation with inversion).
(ii)Storyline: Frame 0–2: Static wide shot showing breadboard with two identical buttons (left/right) and centered LED; all components fully visible, fixed viewpoint, even lighting. Frame 3–4: Finger approaches and fully depresses left button; LED instantly illuminates and remains steady. Frame 5–6: Finger releases left button, waits <0.5s (visibly empty gap), then depresses right button; LED remains illuminated (no interruption). Frame 7–8: Both fingers simultaneously depress both buttons; LED remains illuminated with no change in brightness or stability. Frame 9: All fingers lift; LED extinguishes within one motion interval. Throughout: no object occlusion, no viewpoint shift, no lighting anomaly, no motion violating Newtonian plausibility (e.g., floating fingers, instant acceleration).

Manual:
Experimental Procedure
1. Place two identical tactile buttons side-by-side on breadboard; connect each to separate input row.
2. Connect LED (with current-limiting resistor) to output row, shared common rail.
3. Press button A alone → observe LED.
4. Release A, press button B alone → observe LED.
5. Press both A and B simultaneously → observe LED.
Observation of Experimental Phenomena
- LED OFF when both buttons released.
- LED ON when only button A pressed.
- LED ON when only button B pressed.
- LED ON (same brightness) when both buttons pressed.
Summary of Experimental Principles
Pressing any key lights the LED; LED turns off only when all keys are released; brightness unchanged when both keys pressed — behavior of a two-input OR gate.

Prompt Grounding rubric:
level_1: No breadboard, no two buttons, no LED, or no visible input/output terminals; none of the objects named in the prompt appear.
level_2: The breadboard and two physical buttons are visible, but the LED is missing, or only one button is actually wired in, or the wiring isn't visibly connected to the breadboard, or no pressing action is shown at all.
level_3: The breadboard, two visibly identical buttons side-by-side, and one LED are all present in the same shot; button-pressing actions occur, but the required sequence (A alone, then B alone, then both together) is out of order or incomplete: e.g., both buttons are pressed together before either is pressed alone.
level_4: All three objects are present and correctly identified, and the pressing sequence itself is shown in full and in the correct order (button A alone, then button B alone, then both together), with no step skipped, no extra press inserted, and no object substituted partway through.
level_5: All conditions for score 4 are met, and additionally: the two buttons look identical in size, color, and mounting; the LED sits centered relative to the buttons; the wiring between buttons, breadboard, and LED is fully visible and consistently routed with no dangling or disconnected wire; each press is unambiguous, with the finger visibly making full contact with the button being pressed in every instance.

Scientific and Causal Correctness rubric:
level_1: The LED never lights under any button combination, or it stays lit no matter what, or it goes dark when either button is pressed; none of this matches the expected behavior at all.
level_2: The LED lights for only one of the two buttons and not the other, or it only lights when both are pressed together, or it goes dark specifically when both are pressed, or its brightness visibly changes when both buttons are pressed together instead of staying the same.
level_3: The LED lights when A alone is pressed, lights when B alone is pressed, and stays lit when both are pressed together, but at least one of these events has the wrong timing, such as the LED turning on slightly before the finger actually touches the button, or staying lit briefly after the button is released.
level_4: The LED's behavior matches the expected pattern exactly: dark when neither button is pressed, lit for A alone, lit for B alone, and lit for both together, with the LED turning on and off only while a button is actually being held, no lag, and no premature activation.
level_5: All conditions for score 4 are met, and additionally: the LED's brightness looks the same in all three lit states (A alone, B alone, both together); there is no visible difference in how bright or steady it looks between them, and no flicker or dimming during the moment of switching from one press state to another.

Spatiotemporal Consistency rubric:
level_1: A component (breadboard, button, or LED) appears or disappears mid-video with no cause; a button changes position or orientation with no visible motion causing it; the breadboard's rows or structure abruptly misalign as if it broke apart.
level_2: A button, the LED, or a wire briefly disappears from view for at least a frame and doesn't reappear the same way it left; the shadow cast by the LED vanishes and comes back pointing a different way with no light source change shown; a wire connection looks visibly broken partway through the video.
level_3: The breadboard, both buttons, and the LED stay in the same place and fully visible for the whole video; the wiring stays visibly connected from the buttons through the breadboard to the LED without any gap appearing; the LED's brightness never jumps up or down except in step with an actual button press or release.
level_4: All conditions for score 3 are met, and additionally: each finger's approach to a button looks like natural, smooth hand motion rather than jerking or appearing to float toward the button; the moment the LED turns on or off lines up closely with the moment the finger actually touches or leaves the button, without a noticeable delay.
level_5: All conditions for score 4 are met, and additionally: no motion blur hides whether a button is pressed or what the LED is doing; the camera's viewpoint doesn't drift or shift relative to the buttons and LED at any point; the buttons and LED keep the same spacing and side-by-side arrangement relative to each other for the entire video, without appearing to grow, shrink, or shift apart.