Chaos Kinetic Scuplture Kit

I’ve always loved kinetic scupltures, especialy the marble kind — balls that roll around a track, do things, make noises, then get hoisted back up again. You may have seen them at the Boston or San Jose airports.  Probably made by George Rhoads.
For my latest birthday, I got a fancy kit for making your own. This is much fancier than those plastic tube things designed for younger kids. Fancier than using some general-purpose kits like Kinex. This is called Chaos World of Motion. Here are some pictures:

Here’s an article talking about this and other marble roll kits.