DIY music controller uses water
Toriton Plus is a musical instrument that reacts to fingers dipped in a bowl of water.
How does it work? Lasers over the face of the deep, interrupted by ripples. Only a few inches deep, but still.
Toriton plus prototype: first look [Toriton via Makezine]

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I want to hear what that sounds like when it's in the rain.
When it rains, it plays lounge music.
Finally a practical use for chaos theory.