What is a stereogram?
“A Stereogram is an optical illusion of depth created from flat, two-dimensional image or images. Originally, stereogram referred to a pair of stereo images which could be viewed using stereoscope. Other types of stereograms include anaglyphs and autostereograms.
Stereogram was discovered by Charles Wheatstone in 1838. He found an explanation
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What is a stereogram
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