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A storm scene shows a bright lightning flash in the sky, but the thunder is heard clearly before the flash becomes visible, reversing the normal order imposed by the different propagation speeds of light and sound.

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Per-prompt rubric

Basic standards

Visual presence

  • a lightning flash
  • a storm sky

Event: a lightning flash appears in a stormy sky

Audio presence

  • thunder

Sound: a thunderclap

Key standards

Visual physical commonsense (V-PC)

  • A bright lightning flash visibly appears in the storm sky during the clip with the brightness and shape of a real lightning bolt.

Audio physical commonsense (A-PC)

  • A clear thunder sound with the deep low rumble and sharp crack of a real thunderclap is audible during the clip.

Cross-modal physical commonsense (AV-PC)

  • The thunder sound plays in the audio before the lightning flash visibly appears in the sky.
  • No new thunder onset coincides in time with the visible appearance of the lightning flash.