The science museum in London has a really beautiful stainless-steel model of a combination lock similar to his wooden one. The first time I played with it and s

The science museum in London has a really beautiful stainless-steel model of a combination lock similar to his wooden one. The first time I played with it and saw the bar fall into the slots was one of those wonderful "holy cow!" moments when something you always thought of as deep magic is revealed as having a simple principle behind it.