The LEGO Domino Machine That Resets Itself Forever
A LEGO machine knocks down a ring of 64 dominoes on one side while quietly standing them back up on the other — and it can run, in theory, forever.
Watch For
Watch the far side of the ring. While dominoes topple on one side, a ramp on the opposite side is quietly standing them back up — the fall and the reset chasing each other around the loop, always about half a ring apart.
An infrared sensor watches a single domino and nudges the ramp's speed up or down to keep the two exactly in step. Then save your attention for the very end: to stop the run, he doesn't hit a brake. He tells the ramp to speed up until it catches every last domino and leaves the whole ring standing.
