Crosseyed Stereo 3D stacked scorpion

You should be able to see a 3d scorpion here, but it is a bit difficult

seeing them and not everyone can. the two pictures are supposed to

represent the image that each eye would see when looking at the

subject. To see it in 3d you have to superimpose one image ontop of the

other by going a little crosseyed. your brain does the rest. It can be

quite effective. Try being directly infront of the screen, perhaps a little

nearer than you usually get. Then go a little crosseyed. you end up

seeing three images, the center image is the left hand image in the right

eye superimposed on the right hand image in the left eye. If you then

concentrate on the center image you should quite clearly see it as 3d

and in this case it makes it clearer which legs are infront of what etc. I

think it was the victorians that started it with some novelty cards, but it

is actually usefull for mathmatitians for plots and biologists and

chemists looking at molecule representations etc.