(Ferrofluids are shiny black liquids made of nanoparticles of an iron-bearing substance like hematite in a carrier fluid. If you stick them in a magnetic field, they get all spiky like a porcupine. No really. They do.)
Now you need to know about the uber-mega-crazy-awesomeness of Ms. Sachiko Kodama, who makes breathtakingly cool art with them.
Go here and watch some of the videos:
It's all in Japanese, but you can find the "Movie" buttons. I've only watched a couple of them so far, because I'm rationing them. Morpho Tower is one of the coolest things I've ever seen.