No, seriously, take a look at these:
http://gcoe.mims.meiji.ac.jp/jpn/movie/impossible_motions2/index.html
It's like he sculpted an MC Escher painting. My personal favorite is the one around the 10:00 mark, reminding me of a passage from Call of Cthulhu where the narrator speaks about seeing his friends falling up a hill that was slanted downwards.
And this article was where I found it, and explains it all! www.npr.org/blogs/krulwich/2011/01/19/133017843/your-lying-eyes-can-this-be-happening