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:

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.

Caroline Williamson is the former Editor-in-Chief of Design Milk and a writer with a passion for modern design, architecture, and creative culture. She holds a BFA in photography from the Savannah College of Art and Design (SCAD) and can usually be found searching for vintage wares, solving New York Times crossword puzzles in pen, or curating Spotify playlists.

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