It’s a small folded paper dragon that appears to watch you closely as you move about the room. I’m not talking about the standard “that picture is looking at me” optical illusion some paintings have, but an egads-its-head-is-turning-to-follow-me illusion that is very startling to see.
The site includes not only a link to a small video file of the illusion in action, but also has the dragon available to download and print out in both JPG and PDF formats so you can make your own dragon to freak people out with. I plan on making one for my desk at work so my coworkers will leave me alone. Go check it out.