optical art

Op art, also known as optical art, is used to describe some paintings and other works of art which use optical illusions. Op art is also referred to as geometric abstraction and hard-edge abstraction, although the preferred term for it is perceptual abstraction. The similar sounding Pop art and Plop art are art terms unrelated to Op art.
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1955 - 1965 abstract art movement favoring visual effects and illusions - based on geometric style elements - also called op art - compare retinal art and groupe zero 

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optical art
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