well, I can see the theory behind it but I can't get my eyes to quite connect the pictures. Can't figure out if I'm too close or too far from the screen. Just managed to make it look like there were four images and gave myself a headache. In addition don't we exist in 3D space? (up-down, forward-backward, left-right) Would be kind of hard to create an image for which our present grasp of the laws of physics doesn't allow?
"I have never in my life envied a human being who led an easy life; I have envied a great many people who led difficult lives and led them well."