A plane image or pair of two-dimensional images that, when appropriately viewed using both eyes, produces an image which appears to be three-dimensional. By taking a pair of photographs from slightly different angles and then allowing one eye to view each image, a stereogram is not difficult to produce.
Amazingly, it turns out that the three-dimensional effect can be produced by both eyes looking at a single image by defocusing the eyes at a certain distance.
Such stereograms are called "random-dot stereograms."
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