Another curious device made by aklego, this time it makes projections of the sine and cosine mathematical functions, using gears in epicycloid configuration.
As said in video description:
"This machine is a physical reproduction of a program entitled SineCosine that ships with the computer language "Processing" The program makes four dots oscillate in simple harmonic motion, each pair being 90° out of phase . This machine does the exact same thing. Rotary motion is converted to simple harmonic motion using an epicycloid straight line mechanism."