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- Wikipedia: Op Art
Overview of the abstract art movement also known as Optical Art that thrived in the 1960s.
- Artcyclopedia: Optical Art
Concise definition and historical summary of the mathematically-oriented form of abstract art.
- ArtLex: Op Art
Features a brief definition and several examples of the style.
- Colorcube: Optical Art
Includes numerous optical illusions of the type employed by some Op Art artists.