Dizzying designs (2,3)

I think it could be either:

Which length description are you looking for?:

2,3

op art

'dizzying designs' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for op art that I've seen before include "Style of painting having an illusion of movement" , "Modern style" , "Illusory abstract form" , "Illusory graphic work" , "Sixties movement" .)

I've seen this clue in the LA Times, The Wall Street Journal and the King Feature Syndicate.

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