Illustration of the operation of logic gates using cables and balances

Microsoft employee Alex Gorishek (a biologist by training) posted on Vimeo a curious video in which he demonstrates the operation of the main logic gates of the computer (NOT, AND, OR, XOR, NAND, etc.) using a system of cables and balances. He used a chessboard as a stand for his demonstration. On the left are the valve gates, on the right is the exit. It turned out very clearly, such a stand would not hurt at school in computer science classes: