The math of juggling

I have juggled for most of my life, learning how to juggle when I was eight years old. It has been a very important part of my life. I have my stock of tricks that I do. I have been working on getting better at juggling five balls, and trying to learn a few new tricks that have eluded me. 

One concept I have always struggled with is Swap Site notation -- basically breaking a juggling pattern down into numbers to denote the throws. I have read multiple articles, but it just won't click for me. So I'm posting yet another link to another article (this one with video) so that one day I may dedicate the time and brain power to making this make sense.

http://www.mathaware.org/mam/2014/calendar/juggling.html