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A Calculator for Kids: Knock Knock by Khalil Klouche

Knock Knock is a playful calculator made for children by designer Khalil Klouche. The interactive wooden box lets you “knock” out math problems by using the standard arithmetic symbols displayed on the device. Using an Arduino board, contact microphones, and solenoids, you “knock” the math problem and it sounds the answer back to you.

Watch how:

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For example, say you want to subtract two from a number, you knock the ‘minus’ symbol two times and it will then give you the answer in a knocking sound.

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Caroline Williamson is Editor-in-Chief of Design Milk. She has a BFA in photography from SCAD and can usually be found searching for vintage wares, doing New York Times crossword puzzles in pen, or reworking playlists on Spotify.