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Random-dot stereogram (RDS) is stereo pair of images of random dots which, when viewed with the aid of a stereoscope, or with the eyes focused on a point in front of or behind the images, produces a sensation of depth, with objects appearing to be in front of or behind the display level.
The random-dot stereogram technique, known since 1919, was elaborated on by Béla Julesz, described in his 1971 book, Foundations of Cyclopean Perception.
Later concepts, involving single images, not necessarily consisting of random dots, and more well-known to the general public, are autostereograms.