Saw these Youtube vids - they're pretty neat. There are six of them, watch them in order. Most are about a minute, the longest is about 3 1/2 minutes. There is a lot of info if you click on "more info" in the description box.
http://www.youtube.com/watch?v=X1lpoU9J ... re=related
Once you watch the first one you can find the others in the "see related videos" box.
Enjoy!