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A bolt of lightning flashes across the sky. Several seconds later, the rumble of thunder reaches the observer.

C1-3-37 Steady State · sound_persistence principle: Causal (Wave)
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Per-prompt rubric

Basic standards

Visual presence

  • lightning
  • a sky

Event: lightning flashes across the sky

Audio presence

  • thunder

Sound: thunder rumble

Key standards

Visual physical commonsense (V-PC)

  • A bright branching lightning bolt appears against the sky and then fades or disappears.

Audio physical commonsense (A-PC)

  • The thunder has the broadband low-frequency rolling rumble character of distant thunder.

Cross-modal physical commonsense (AV-PC)

  • A thunder rumble in the audio is paired with the visible lightning flash in the scene.
  • The thunder rumble begins several seconds after the visible lightning flash.