11yo's original design for sorting balls into groups of 4.pic.twitter.com/Sd6LsUMLTp
My brother and I used to have a game as children from the Early Learning Centre (a shop for kids in UK that we also had in Cyprus) that was called a Marble Run. After many years we both got uni degrees him in Physics and me and Computer Science...
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and one day we went round to our young (he was 5 at the time) cousins’ house who had the same game as well and we played with him. After all those years we finally realised something. We both looked at a piece we also had as kids and pretty simultaneously went: it’s a flip-flop!
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Now, years after that too… I see somebody has made it the USP of a toy specifically!
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Apparently it's Turing-complete!
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If you have a NAND-gate or equivalent, of course it is!

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I think this might be on the family tree somewhere...https://www.youtube.com/watch?v=9KABcmczPdg …
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