New Scientist TV: Friday Illusion: Impossible 3D shape conceals six tricks | Science News | Scoop.it
From www.newscientist.com - September 30, 2011 3:02 AM

The spinning 3D shape in this video conceals six different illusions. To see it in 3D, you'll need to cross your eyes until the two images overlap and merge together. (If you're having trouble, try viewing the video in full screen or check out some tips here).