stereogram - dinosaur - A stereogram is a picture that creates an optical illusion of depth. A stereogram or autostereogram hides a three-dimensional picture behind a two-dimensional picture and allows a person to see the hidden picture by adjusting or focusing his or her eyes correctly to the picture. An effective way to look at stereograms is to relax the eyes and pretend to be daydreaming or 'zoning off into space'. This way you can begin to see the hidden picture in the stereogram.