random dot stereogram
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I have been creating this type of Random Dot Stereogram since the 1970's and my prints of this type have been in museums throughout the world since that time. In those times I created these images photo-mechanically, that is, building models, lots of darkroom work and assembly of kodalith film on a large light table. An image might take two months to create... I made this example in an evening, using Adobe Photoshop.