If you’ve ever lost an afternoon watching the Wintergatan Marble Machine, you’re going to appreciate the sheer mechanical stubbornness of this latest build from Brick Machines. We’re talking about an autonomous LEGO instrument that ditches marbles for tiny plastic soccer balls, dropping them onto xylophone bars with the kind of rhythmic precision that would make a metronome sweat. The best part? It’s a closed-loop system that hauls the balls back to the top to start the sequence all over again, effectively creating a “perpetual” music box that only stops when you pull the plug.