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A person claps once inside a grand stone cathedral. The sharp clap is followed by a long spacious echo that lingers for several seconds.

C1-3-26 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
  • a stone cathedral

Event: a person claps inside a cathedral

Audio presence

  • a person

Sound: a hand clap

Key standards

Visual physical commonsense (V-PC)

  • A single person performs a single hand clap inside a stone cathedral.
  • The clip shows the interior of a recognizable stone cathedral.

Audio physical commonsense (A-PC)

  • The clap is followed by a spacious reverberation tail lasting several seconds.
  • The reverberation has the bright sustained character of a large hard-surfaced cathedral.

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.