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A person taps an empty glass bottle with a mallet and it rings at a bright high pitch. Then taps a half-filled bottle, and it rings noticeably lower.

C2-1-18 Event Transition · source_body principle: Mass Loading -> Pitch (Mechanics)
Seedance 2.0ByteDance · proprietary
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Veo 3.1Google · proprietary
LTX-2.3Lightricks · open
Ovi 1.1character.ai · open
JavisDiT++JavisDiT · open
MagiHumanGAIR-NLP · open
Per-prompt rubric

Basic standards

Visual presence

  • a glass bottle
  • a mallet

Event: a glass bottle is tapped with a mallet

Audio presence

  • a glass bottle

Sound: a bottle tap ring

Key standards

Visual physical commonsense (V-PC)

  • An empty glass bottle and a water-filled glass bottle are each visibly tapped by the mallet in sequence, with each tap visibly contacting the bottle.

Audio physical commonsense (A-PC)

  • The tap ring from the water-filled bottle is noticeably lower in pitch than the tap ring from the empty bottle.

Cross-modal physical commonsense (AV-PC)

  • Each ring sound aligns in time with a visible tap of the mallet against a bottle.
  • The lower-pitched ring corresponds to the water-filled bottle.
  • The higher-pitched ring corresponds to the empty bottle.