This wall-mounted rolling ball sculpture packs a lot of movement and variety into the design. It includes the always-popular loop-d-loop, along with a tall skinny spiral made from two separate spirals connected in series. A long horizontal zig-zag, sections of wavy track, and plenty of regular track give the marbles a constantly changing path through the sculpture.

One of the more interesting features is a ball-collecting tipping arm that can be adjusted to collect one, two, or three marbles before releasing them together. From there, the marbles travel along the track before entering a flat perforated-steel collector and making their way into a tight hairpin section.

This is where things become a little unpredictable. Multiple marbles can enter the hairpins together, bouncing, colliding, and interacting with one another differently each time through.

Check out the video to see the whole sculpture in action!