Have you seen this? It is crazy! This dragon toy is an optical illusion that seems to turn its head to follow you around the room and even up and down. It works!
We printed and built a big green one and then spent the remainder of the evening leaping around the living room flipping out about it. Took us a minute, because we forgot to close one eye. As soon as we did, it faked out our minds. This is so
Page with demonstration video link and download link:
Even if you don't make your own paper dragon, you might enjoy the site. It's an intriguing little website with illusions and bizarre collections of things, like the dieing Mediterranean art of orange peel decorative boxes and strange musical instruments.