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A triangle is struck and sustains a bright ringing tone. Then the player touches the triangle with the other hand and the sound vanishes.

C2-3-21 Event Transition · source_radiation principle: Resonance Damping (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a triangle
  • a player's hand

Event: a player touches a struck triangle with the other hand

Audio presence

  • a triangle

Sound: triangle ring

Key standards

Visual physical commonsense (V-PC)

  • A triangle percussion instrument is suspended from a string and visibly struck with a beater.
  • The player's other hand visibly touches the triangle while it is still ringing.

Audio physical commonsense (A-PC)

  • A bright sustained ringing tone from the triangle is audible after the strike.
  • The ringing tone vanishes almost instantly once the hand contacts the triangle, with no residual ring.

Cross-modal physical commonsense (AV-PC)

  • The ring onset in the audio aligns in time with the visible mallet strike on the triangle.
  • The abrupt end of the ring coincides in time with the visible moment the hand contacts the triangle.