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A metal ruler sticks out over the edge of a desk. A finger flicks the tip and it buzzes at a high pitch. Slid out further and flicked again, the buzz is much lower.

C2-1-01 Event Transition · source_body principle: Vibrating Length -> Pitch (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a metal ruler
  • a desk

Event: a finger flicks the free end of a metal ruler overhanging a desk edge

Audio presence

  • a metal ruler

Sound: a metallic buzz from a flicked ruler

Key standards

Visual physical commonsense (V-PC)

  • The ruler is flicked twice, and between the two flicks the length of the ruler overhanging the desk visibly increases.
  • The ruler remains rigid and straight throughout the clip, with visible gradations typical of a metal ruler.

Audio physical commonsense (A-PC)

  • The second buzz has a noticeably lower pitch than the first buzz.

Cross-modal physical commonsense (AV-PC)

  • Each buzz onset aligns in time with a visible flick of the ruler.
  • The lower-pitched buzz corresponds to the flick with the longer overhang; the higher-pitched buzz corresponds to the flick with the shorter overhang.