Turing Tumble

Turing Tumble is a Turing machine, a computer in other words, entirely mechanical based on falling metal balls in various gears. Honestly, I try to describe, but the best is to watch the video:

It allows to go through progressive steps in the complexity of operations in a very efficient way. The accompanying booklet is also made for, since it proposes a progression of logical functions, and therefore of constructions, in the form of puzzle / puzzle game where a part of the editing is given, as well as the desired function. After, it takes a little concentration and investment to truly immerse yourself in it.