Brusspup's "rolling illusion toy" is simple to make, and produces an illusion while in motion that's just wonderful. As he demonstrates, the more rings you add to it, the cooler it looks.
This toy is based off of a toy called Sin that was designed by Peer Clahsen. It's really quite simple to make and the illusion can be stunning. I added another set of 2 to see what type of effect I could get and I was surprised how cool it turned out. I sprayed the 4 version with UV paint and then used black lights. In the sideways sequence at the end, the illusion is spoiled a bit because you can see the glue. If you use use less glue, the effect would be better.