Crossword Genius

Work by Bridget Riley, for instance (2,3)

Ross

I believe the answer is:

op art

(Other definitions for op art that I've seen before include "Abstract geometrical genre of painting" , "that may give the illusion of movement" , "Illusory design style" , "Style of abstract painting using illusion etc" , "confusing images" .)

I've seen this clue in The Guardian.
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