Op 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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Noun
1. a style of abstractionism popular in the 1960s; produces dramatic visual effects with colors and contrasts that are difficult for the eye to resolve
(hypernym) abstractionism, abstract art

1955 - 1965 abbreviation of optical art - abstract art movement favoring visual effects and illusions - based on geometric style elements - compare retinal art and groupe zero 

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op art
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n. การศึกษาศิลปะแนวสื่อความหมายด้วยรูปแบบเรขาคณิตและสี (syn. Op Art, Op)