I haven't made any videos in months. I had his idea recently, and thought I'd throw it together. Lately, videos on Vimeo have been playing very poorly; possibly something Vimeo is doing with their encoding, possibly Flash 10 on OS X is the culprit, but many, many videos here play only jerkily, even if I let the whole video load and restart at the beginning.

Anyway, this is a simple idea made in processing (processing.org).