Crossword Genius

Paintings based on geometrical forms (2,3)

Ross

I believe the answer is:

op art

(Other definitions for op art that I've seen before include "Nineteen sixties illusory painting style" , "picture, apparently" , "Illusory form of painting" , "Illusory graphic style" , "Illusory design style" .)

I've seen this clue in the Sydney Morning Herald.
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