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The Domino Computer
A playable guide to how we built a computer from 10,000 dominoes
(If you’re reading this on a mobile device, you might not be able to add dominoes, but you should be able to cheat your way through using the “reveal answer” buttons — or play along when you get back to a computer with a mouse.) I’m not going to make you build the entire domino computer with your mouse, but you’ve built every major component of it now. If you scroll back to the top and watch the video (again), perhaps you’ll be able to see all the XOR gates and Full Adders as they fall.
Or read this on Hacker News