Siteswap - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Siteswap
"Siteswap (also called Cambridge notation in the United Kingdom) is a notation used to describe juggling patterns."
Boing Boing: High-speed Dance Dance Revolution kid juggling three pins
http://www.boingboing.net/2005/04/20/highspeed_dance_danc.html
My god. I'd love to see an MRI or something of his brain while all this is going on, just to see what all he's got lit up in there to coordinate things.