A relief sculpture or carved design where the image projects slightly from a flat background, or a composite image using layered colors to create a 3D stereoscopic effect.
From Greek ana- (up, back) + glyphē (carving, engraving). Originally described carved ornaments, but the term was later applied to 3D imaging techniques in photography.
Those old-school 3D glasses with red and blue lenses? They work with anaglyphs—two slightly offset images in different colors that your brain combines into one 3D picture. It's a hack that tricks your visual system into seeing depth.
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