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I present to you a clockwork design illustrating the series of movements made by a drive wheel (at left), meshing with its Maltese-Cross-shaped stop (at right).
You can see this movement animated on wikipedia here...go ahead, I'll wait:
Hypnotic, isn't it?
That was the great thing about pre-solid-state technology...If you were clever and observant...you could figure out how your stuff worked.
It's all magic boxes now...Unless you go steampunk!