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Posts: 177 | Thanked: 4 times | Joined on Apr 2006 @ Wirral, UK
#21
Originally Posted by msaunby View Post
If you want a real challenge try shaving or combing your hair while looking at the image.


So why does a mirror swap left and right but not up and down? Perhaps Nokia have now solved this mystery.
The mirror swaps everything, it just happens that we humans have right and left sides. If we had an upper and lower hand with corresponding internal representations in the brain then you would ask your question the other way round.

A losely related one is Codman's (apparent) paradox, more generally the non-commutativity of 3D rotations, but I digress...