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I believe you are thinking of what are called Illusion cards. some have tricks of perceptual vision, 3-d overlays, color changes, etc. others work on different colors, perspective and such things as geometric Moire patterns associated with Science Fiction, the video communications screens on Star Trek would dissolve into Moire patterns when not in use- and they were also used in the Time Tunnel , sometimes called infinity patterns. good luck . Edmund Scientific used to sell sets of illusion cards.They probably still do.

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