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Information citations Victor Vasarely, Leader of the Op Art Movement (function() { Var Po = Document.createElement('script'); Po.type = 'text/javascript'; Po.async = True; Po.src = ' Var S = Document.getElementsByTagName('script')[0]; S.parentNode.insertBefore(po, S); })();." Victor Vasarely, Leader of the Op Art Movement, Masterworks Fine Art. Masterworks Fine Art., Web. 23 Nov Payne, Olly. "Bridget Riley | Op-art.co.uk." OpArtcouk RSS. N.p., Web. 23 Nov "Drawing Hands by Escher." Drawing Hands by Escher. N.p., Web. 23 Nov "The Official M.C. Escher Website." The Official M.C. Escher Website. The M.C. Escher Company B.V, Web. 23 Nov