The coolest looking thing on the internet. I love the internet.

One time, a really long time ago, I came to NYC and waited around the back stage door of the David Letterman studio. They had this kiddie pool filled with cornstarch and water, that you could sink into if you moved slowly, but if you moved fast, you could run across it. They were using it for stupid human tricks, and the mixture blew my mind. I took a cup full and played with it probably all day long.

I saw this today. The water patterns are really great... but the strange blobs from the cornstarch/water are even better.