I find this fascinating. The way my mind works, , I found Merkle's 20 minute talk to be very informative (included near bottom of post). Digital computation was done with tubes, then with transistors and now there is a suggestion that mechanical devices might supersede transistors. The NAND gate is fundamental to how CPUs work. If you can implement NAND, you can implement a CPU. https://tennysontbardwell.com/blog/2025/04/30/mechanical-computing/index.html