A stereogram is an optical illusion that accomplishes a tridimensional visualization from a bidimensional image.
To see the expected effect, it is necessary to unfocus the image, as if looking beyond. It's difficult to do the first time, until you learn the technique.
Some people recommend moving the paper slowly towards your eyes without adjusting focus, others focus first a object farther away.
For more information on stereograms, visit Wikipedia
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One of the most versatile stereogram creation programs (like the Magic Eye book series), allows you to mix a texture and a depth map and obtain a stereogram. Supports BMP and JPG files.
These are some samples of the stereograms that can be made.
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