'Visible State' (1966) and 'Between' (1966) by American artist and Op Art leader Richard Anuszkiewicz— a few more here instagram.com/p/CUSTZDjqWQt/
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'My work is of an experimental nature', said Anuszkiewicz in 1963, 'and has centered on an investigation into the effects of complementary colors of full intensity when juxtaposed...'
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'... and the optical changes that occur as a result and a study of the dynamic effect of the whole under changing conditions of light, and the effect of light on color.'
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'Radiant Green' (1965) by Richard Anuszkiewicz
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