Domain: Engineering — Electrical Engineering
Target concept: When both buttons are pressed (both inputs are high), the LED does not light up. When one button is pressed or neither is pressed, the LED lights up. The state transition is clear and free of ambiguity.

Video generation prompt: Build a two-input digital logic circuit on a breadboard (with two input terminals), using two buttons as inputs and an LED as the output; first press each button individually once, then press both buttons simultaneously, and record the LED's lighting status.

Evaluation guide:
(i) Target concept: Two-input combinational logic realized via physical circuit where mechanical button actuation maps to digital HIGH/LOW, and LED illumination directly reflects output voltage level.
Minimum mechanism: Buttons must be normally-open momentary switches wired active-high (pull-up or direct Vcc path); LED anode connected through resistor to output node, cathode grounded; no external logic ICs; functionality must emerge solely from discrete wiring and component properties.
(ii)Storyline: Frame sequence begins with static wide shot of complete breadboard setup (buttons + LED visible). First action: finger depresses left button only; LED illuminates instantly and stably. Second action: finger releases left, then depresses right button only; LED remains illuminated. Third action: fingers depress both buttons simultaneously; LED extinguishes instantly and remains off until release. All actions occur from fixed frontal viewpoint; no occlusion of LED or button actuators during contact; lighting uniform; no secondary objects interfering.

Manual:
Experimental Procedure
1. Place two identical tactile buttons side-by-side on breadboard; connect each to separate input rows.
2. Connect LED (with current-limiting resistor) to output row.
3. Press Button A alone → observe LED.
4. Press Button B alone → observe LED.
5. Press both Buttons A and B simultaneously → observe LED.
Observation of Experimental Phenomena
- LED lights up during Step 3.
- LED lights up during Step 4.
- LED does NOT light up during Step 5.
Summary of Experimental Principles
NAND gate behavior: output is LOW (LED off) only when both inputs are HIGH (both buttons pressed); output is HIGH (LED on) for all other input combinations (00, 01, 10).

Prompt Grounding rubric:
level_1: No breadboard appears, or fewer than two separate buttons are visible, or no LED is present, or none of the components are shown wired onto the board; the video shows no more than one button press and never shows both buttons pressed together.
level_2: A breadboard and an LED are shown, but only a single button is ever visible or used; or both buttons appear yet neither one is pressed by itself before the simultaneous press; or the two buttons are never pressed together at all.
level_3: A breadboard holds two visibly distinct buttons and one LED, all connected into the board; the video shows, in this order, the first button pressed alone, then the second button pressed alone, then both buttons pressed together at the same moment; the LED stays visible through all three of these events.
level_4: Beyond that: the two buttons share the same size and shape and sit side by side on the board as a matched pair; the LED is positioned where it can be clearly seen relative to both buttons; nothing blocks the circuit from view during any of the three presses; and each press shows the finger making real contact with the button rather than hovering near it.
level_5: Beyond that: each of the three press events shows the button actuator visibly traveling downward under the finger and springing back up on release; the hand fully withdraws between the three press actions so each reads as a separate, clearly distinguishable demonstration; and the breadboard, both buttons, and the LED all stay fully visible for the entire sequence, with no cut or reframing that hides any part of the wiring.

Scientific and Causal Correctness rubric:
level_1: The LED lights up specifically when both buttons are pressed together, or stays dark for single or no presses, the reverse of the intended behavior; or the LED's brightness never changes no matter which or how many buttons are pressed.
level_2: The LED does change state across the three press events, but not in the pattern this circuit calls for: for example, it goes dark during one of the single-button presses, or the two single-button presses produce different LED states from each other, when they should match.
level_3: The LED is lit while the first button alone is held down, lit while the second button alone is held down, and goes dark when both buttons are held down together, matching the intended response for exactly these three tested cases, with no case contradicting this pattern.
level_4: Beyond that: the LED holds a steady brightness during each held press with no flicker or partial dimming; it goes dark only at the moment both buttons are pressed down together, and lights back up the instant either button alone is released or pressed.
level_5: Beyond that: before either button is ever touched, the LED is already lit (with neither input active, this circuit's output is HIGH, so the LED should be on at baseline, not off); each LED transition follows its corresponding button action closely, with no noticeable delay and no moment where the LED lingers in its old state after the buttons have changed.

Spatiotemporal Consistency rubric:
level_1: The breadboard, either button, or the LED disappears from the shot and reappears elsewhere; the wiring visibly breaks or a wire vanishes mid-sequence without the hand ever touching it; the room lighting flashes or flickers with no connection to the button presses.
level_2: The camera view shifts noticeably (zooms, pans, or reframes) between the three press events; the buttons or the LED shift position relative to the breadboard's rows between shots; a shadow cast by one of the components jumps to a different side with no change in the light source; or a wire connection visibly detaches and reattaches on its own between presses.
level_3: The breadboard stays in the same place and framing throughout; both buttons and the LED keep the same position relative to the board's rows and to each other across all three press events; nothing on the board disappears partway through and comes back; the room lighting and the shadows the components cast stay in the same place and brightness the whole time (aside from the LED's own glow); the wiring stays physically intact and in place except where the hand is actively touching a button.
level_4: Beyond that: the hand enters and leaves the frame from the same side for all three press actions; the finger's approach to each button is one smooth, continuous motion with no sudden jump or skip; the area around the LED shows no unexplained brightness change beyond the LED switching on or off itself.
level_5: Beyond that: the breadboard, both buttons, and the LED hold rock-steady positions with no drift or shake across the entire sequence; the hand's motion toward and away from the buttons looks like one continuous physical action each time, with no skipped or sped-up segments; the camera itself never pans, zooms, or shifts perspective; none of the components look warped, stretched, or distorted at any point.