Sometimes, these objects are done by arranging the final cut in a
position such that the camera gives the Escheresque appearance. The
piece, viewed from another angle, could actually be in multiple pieces.
More likely, it 'sticks out' in different directions and has the seam
hiddle by the sitting girl.

I haven't seen this one, but I've seen (in person) the more common ones
like the impossible box. They look like a garbled mess of projectiles,
but when viewed from ONE angle and position, you get the illusion.

RicodJour wrote:

http://www.planetperplex.com/en/img.php?id=153

No points unless you've actually cut the wood and it works.

R