This will probably either die out or end up as a mini-blog. Anyway ball bouncing in place[no decay]: http://starryspelunker.tumblr.com/image/134596979686 Ball bouncing across screen[with decay] http://starryspelunker.tumblr.com/post/134598659748/more-work-with-the-bouncing-ball Critiques would be very welcome.