RGB and XYZ
I think it's going on 14 years or more when I first had the idea: a lighted juggling ball that changes color as it rotates. Seriously - 14 years. I'm fairly sure of this because I told my girlfriend at the time (who eventually became my wife) and she made a prototype. But I get ahead of myself. It was always LED's that did the lighting, of course. It was also a ball. This is important to note as juggling equipment comes in many shapes and sizes. It is lighted from within, hopefully evenly. As this ball (or many) rotates it changes color. Hopefully it is bright enough to be seen from a far in a dark theater and it's obvious that the color is changing. It's not crucial that the juggler be able to control the changes, but that might be a nice option. When I told Jeanette (afore mentioned wife) she made a prototype for a class she was taking in college. It was just after we had started dating - I think during her Junior year. Second half she says, and it was for a physi