The art, practice, or technique of creating anaglyphs, including both carved relief work and modern 3D imaging methods.
From anaglyph + -y (a common suffix forming abstract nouns). It describes the practice or field as a whole rather than individual works.
Anaglyphy includes both ancient stone carvers making relief sculptures AND modern filmmakers creating 3D movies—it's fascinating that one word spans thousands of years of different technologies.
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