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A sewing machine runs steadily. The needle moves up and down rapidly with a fast repeating mechanical click.

C1-3-47 Steady State · sound_persistence principle: Temporal Alignment (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 sewing machine
  • a needle

Event: a sewing machine needle reciprocates up and down

Audio presence

  • a sewing machine

Sound: a mechanical click

Key standards

Visual physical commonsense (V-PC)

  • A visible sewing machine has its needle reciprocating rapidly up and down in continuous physically plausible motion.

Audio physical commonsense (A-PC)

  • The audible clicks have the rapid evenly spaced mechanical-tap character of a real sewing-machine mechanism.

Cross-modal physical commonsense (AV-PC)

  • Each visible needle downstroke coincides in time with an audible mechanical click.
  • The audible click rate matches the visible needle reciprocation rate throughout the clip.