Thank you Philippe Geluck, I couldn't have explained it better

This is not rocket science, but media-biochemistry: 
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What Marilyn Monroe is for the United States  ( MM x US ),
Brigitte Bardot is for Europe  ( BB x EU )

Victor Vasarely (French: [viktɔʁ vazaʁəli]; Hungarian: [ˈviktor ˈvɒzɒrɛlːi]; born Vásárhelyi Győző [ˈvaːʃaːrhɛji ˈɟøːzøː]; 9 April 1906[1] – 15 March 1997), was a Hungarian–French artist, who is widely accepted as a "grandfather" and leader of the short-lived op art movement.
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His work entitled Zebra, created in the 1930s, is considered by some to be one of the earliest examples of op art.

http://www.op-art.co.uk/
https://en.wikipedia.org/wiki/Op_art
http://www.galeriapunto.com/exposiciones.html?id=493.