To demonstrate how computers work, [Alex Gorischek] has made a physical example of how binary logic gates work using pulleys and weights.
For anyone who doesn’t know much about logic gates (Wikipedia), it’s a great lesson in one of the fundamentals of circuitry. Using an old chessboard, eyelets, rings, weights, and string, [Alex] has designed a system that can show off all of the logic gates. This includes: NOT, BUFFER, NAND, AND, OR, NOR, XOR, XNOR. He’s also included a gallery of all his examples here.
The neat thing about this demonstration is it is shown in a way that anyone can understand, heck, it’s also something anyone can play with in order to learn! Stick around after the break and see for yourself.