This was the second of a pair of very large rolling ball sculptures, measuring approximately 8 feet by 8 feet. With its oversized frame and multiple tracks, there was plenty of room for some unusual mechanisms—including perhaps the most loop-d-loops I've ever installed on a single sculpture.

One track sends the ball through an incredible 39 loops in a row. The loops follow a Z-shaped path, carrying the ball back and forth across the sculpture as it works its way from the top of the frame all the way to the bottom.

Another track begins with a multi-ball collector. When the seventh ball arrives, it triggers a release sequence that sends the collected balls out one at a time and into a large Ferris wheel mechanism.

The Ferris wheel is one of the most interesting elements on this sculpture. Two or three of the larger 1-3/8" balls provide enough energy to set the outer wheel in motion. As it spins, the mechanism picks up smaller 1" glass marbles and lifts them onto their own dedicated track. The smaller marbles circle through the system several times, repeatedly getting lifted while the seven larger balls continue through the Ferris wheel. Once the sequence is complete, the entire mechanism gradually slows to a stop and waits for the next group.

The third track includes a teeter-totter catch-and-release mechanism, several interconnected tipping arms, long sections of back-and-forth track and horizontal zig-zags.

There is a lot happening across an 8-foot sculpture like this, and many of the mechanisms make much more sense when you can actually see the timing and interaction between the balls.

To fully appreciate this one, watch the video. Rolling ball sculptures are better in motion anyway. :)