either a pair of images to be viewed with glasses, or a single tiled image viewed by squinting. In both cases, the different views of each eye are "sub-mentally" compared to give the impression of a three-dimensional object emerging out of the picture.

Details and history about 3D glasses, Random Dot Stereograms and magic images

Looking too long at the stereograms will strain your eyes!
If you are too close to the screen, the radiation could damage your eyes!

Examples (both the tiles and the "hidden" images are my own creations):

homage to Vaserely

No Smoking!

petite fleur

Nuclear plant

Last Update: 2003-03-23, Patrick Hahn (