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A person blows across the opening of a long pipe, producing a deep low tone, then blows across a much shorter pipe, producing a bright, noticeably higher tone.

C2-1-05 Event Transition · source_body principle: Vibrating Length -> Pitch (Mechanics)
Seedance 2.0ByteDance · proprietary
Kling 3.0 OmniKuaishou · proprietary
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 long pipe
  • a short pipe
  • a person

Event: a person blows across the opening of a pipe

Audio presence

  • a pipe

Sound: a blown pipe tone

Key standards

Visual physical commonsense (V-PC)

  • Two pipes of clearly different lengths are visible, and the person blows the long pipe first and the short pipe second, in that order.

Audio physical commonsense (A-PC)

  • The tone from the short pipe is noticeably higher in pitch than the tone from the long pipe.

Cross-modal physical commonsense (AV-PC)

  • Each blown tone aligns in time with a visible blow across the corresponding pipe opening.
  • The higher-pitched tone corresponds to the visibly shorter pipe; the lower-pitched tone corresponds to the visibly longer pipe.