Massive 20-module Great Ball Contraption goes on forever

I generally don’t have the patience to watch Great Ball Contraption (GBC) videos, but I couldn’t tear myself away from this amazing 8-minute engineering marvel by Japanese builder akiyuki.

Nannan suggested I post this because I could read up on some of the design descriptions akiyuki writes about on his blog, but really, this thing speaks for itself and therefore I have nothing meaningful to add…