Not the best video, but this wall-mounted Rolling Ball Sculpture has a lot going on. It runs on 1-1/2" miniature billiard balls and has four different tracks, all continuously fed by the chain lift.

Two different loop d’ loops handle the fast action. One has 7 inversions and ends by striking a stationary ball, trading places with it every time. The other starts with a large loop and gets progressively smaller as the ball works through a series of concentric loops. It exits with a strong backspin that slows the ball considerably before it continues down the track.

There’s also a ball-collecting tipping arm that releases onto a fast track running back and forth across the entire frame. Add three flat spirals, three track splitters, a tall skinny coil, horizontal zig-zags, a nice dip in the track and a free-spinning tipping arm, and there’s plenty to keep your eyes moving.

Lots of frenetic action on this one!

100% stainless steel, TIG welded.