Also known as the "Time Fountain," I had to build my own after seeing it on digg one day. In real life it doesn't flicker and is truly fascinating. I wish everyone could see it in real life.
This took me two months and more than a hundred dollars to make... a lot of RnD. My roommates are so sick of it, since I showed it to them every other day saying "look what it does now!" that it's embarrassing to talk about it anymore. But it's new to you!