Hooray! (This was created using the principles of my Slingshot program; I've been wanting to make this for a while.) This program is similar to Canthiar's "Two Masses and a Spring" in its effect, but I intentionally didn't look at his code because I wanted to make my own from scratch (which is pretty much how I like to do everything!). But I'd still like to acknowlege Canthiar because I don't know if I would have made this had I not seen his project first, and also because Canthiar is basically Awesome City. Press S to toggle band stamp on/off. Press R to reset balls' positions. Press SPACEBAR to cycle through 3 backgrounds.