stereogram
/ˈstɛriəˌɡræm/
noun
- A picture or image that appears three-dimensional when viewed in a special way, such as by crossing the eyes or using a special viewer.
- My little brother spent an hour trying to see the 3D image in the stereogram on the back of the cereal box.
- At the science museum, visitors could look at a stereogram through special glasses to see the landscape pop out.
- The magazine included a stereogram of a hidden dinosaur that you could see by relaxing your eyes.