Someone over here - http://news.ycombinator.com/item?id=4946858 - asked for more details about the notation itself, and what the numbers mean, so I thought I'd put this as a separate place for more technical discussion.

Here's a link to a juggling animation package if you want to try out some of this stuff:

http://jugglinglab.sourceforge.net

And some examples:

http://jugglinglab.sourceforge.net/bin/example_stnd.html

http://jugglinglab.sourceforge.net/bin/example_gen.html

They don't work on my browser (Firefox on Ubuntu) and I have no idea why, and don't have time to track it down, but they should work for most people.