Eight of Japan’s sharpest LEGO minds got together at Japan Brickfest 2025 and collectively decided that moving tiny balls a few inches should require maximum brilliance. The result is the most complicated Great Ball Contraption you’ll ever see: 49 LEGO modules linked into a mesmerizing loop stretching over 31 meters around the room.

What’s inside this glorious mechanical masterpiece? Elegant elevators with blink-and-you’ll-miss-it handoffs, bird and dinosaur robots doing very important ball work, and gear assemblies that look suspiciously like sorcery. There’s also a domino machine that seems wildly unnecessary… which somehow makes it perfect. Check it out!

[Via Neatorama]