If you look closely you can see it reverse. So I think it's in an infinite loop.

Yeah, just reversing back and forth is the poor man's version of cinematographs.

http://technostreak.com/news/cinematographs-a-new-dimention-...

I feel they could've done this better. Still an impeccable jobs. The best team page I've seen so far.

In Chrome, right click -> Show Controls.