I wish I could find it again, but I saw a project once that was a meter-long stick of white or blue LEDs hooked up to dozens of shift registers. An RNG would cl

I wish I could find it again, but I saw a project once that was a meter-long stick of white or blue LEDs hooked up to dozens of shift registers. An RNG would clock in ones or zeros at the end of the stick, and they would shift off to the other end of the stick at a pretty high rate. It was a really neat effect! I've been collecting parts to try to recreate it on my own, but... I'd love to be able to find the original again. If anyone else has seen this, I'd like to hear about it.