Quartz Composer by Momo

I just came across with Surya's experiments in Quartz Composer.
This is a technology I have not had time to dive into myself, as I can't seem to make it work on my computer for some reason, but looks very nice. Cityscape, Pixel invaders and Ribbon cube are some of my favorites, really nice work!
He is also kind enough to share his source files, for people to download and learn.