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A person claps once inside a large empty warehouse. The sharp clap is followed by a long smooth echo that slowly fades into silence.

C1-3-27 Steady State · sound_persistence principle: Reverberation (Wave)
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 person
  • an empty warehouse

Event: a person claps inside a warehouse

Audio presence

  • a person

Sound: a hand clap

Key standards

Visual physical commonsense (V-PC)

  • A single person performs a single hand clap inside an empty warehouse or large industrial space.
  • The clip shows the interior of a recognizable empty warehouse or similar large space.

Audio physical commonsense (A-PC)

  • The clap is followed by a smooth reverberation tail that decays gradually over several seconds.
  • The reverberation is consistent with reflections off hard surfaces in a large enclosed space.

Cross-modal physical commonsense (AV-PC)

  • The clap transient in the audio aligns in time with the visible hand-clap action.
  • The reverberation tail in the audio follows the single visible clap as its consequence.