I'm guessing it's drawing based on linked spring physics (and reflected) because I did something similar in 2009: http://www.mrspeaker.net/dev/canvas/springs.ht

I'm guessing it's drawing based on linked spring physics (and reflected) because I did something similar in 2009: http://www.mrspeaker.net/dev/canvas/springs.html http://www.mrspeaker.net/dev/canvas/springs.html (view-source for code ;)