← all videos

A tuning fork is struck and rings at a clear pitch. Then a small clip is attached to one prong, and the next strike rings noticeably lower.

C2-1-19 Event Transition · source_body principle: Mass Loading -> 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 tuning fork
  • a clip

Event: a tuning fork is struck

Audio presence

  • a tuning fork

Sound: a tuning fork ring

Key standards

Visual physical commonsense (V-PC)

  • The tuning fork is visibly struck twice, and a small clip is visibly attached to one prong between the first and second strikes.
  • The instrument is a tuning fork with two parallel prongs joined at a U-shaped handle.

Audio physical commonsense (A-PC)

  • The second ring with the clip attached is noticeably lower in pitch than the first ring without the clip.
  • The strike sound has the sustained bright metallic ring of a tuning fork.

Cross-modal physical commonsense (AV-PC)

  • Each ring onset aligns in time with a visible strike of the tuning fork.
  • The lower-pitched ring corresponds to the state with the clip attached.
  • The higher-pitched ring corresponds to the state without the clip.