Knock-Knock Analog Interface For Calculator [Video]

Knock-Knock Analog Interface For Calculator [Video]

Electronic device uses sounds to calculate equations.

Yi Chen
  • 29 april 2013

Designer Khalil Klouche has created a calculator for kids that is more playful and interactive. The gadget called Knock Knock is essentially a wooden block with the four math symbols: addition, subtraction, multiplication, and division.

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