So I put together this little demo, and this is a good one to take the trouble to download because it's fun. Or, at least, I think it's fun. It's based on the same engine as the pile-o-balls simulator, except this one uses springs. Every time you right click, the game generates an new shape for you to drag around, and every time you press the up or down arrow, the stiffness of the springs is raised or lowered.
So take a look, it can't be that bad, right?
https://sites.google.com/site/stylustechnology/recent-stuff/spring-shapes
