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The Kid Should See This

Knock Knock – A touch & sound calculator

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Mathematical calculations created with touch and sound… and the help of an Arduino board, contact microphones and solenoids. The Knock Knock was designed by Khalil Klouche as a concept for the “Touch!” exhibition at Lausanne’s Museum of Design and Contemporary Art (MUDAC) in 2012.

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Knock on the different operators and it knocks back the answer. Watch. And then check out more inventions of one kind or another.

via Design Boom.