Random Dot Stereograms

RANDOM DOT STEREOGRAMS are pictures which create 3-D images out of two dimensions. Each picture consists of randomly placed dots created by a computer. When you view the pictures through polaroid filters, a different set of dots (or images) goes to each eye, creating an image with depth. These pictures were originally designed by psychologist, Bela Julesz, to determine whether depth perception takes place in the eye or the brain. The results indicate the the brain is responsible, as neither eye alone has enough information here to see the 3-D forms.