Op art (Optical art) is an artistic movement dating from 1950s which plays with the visual perception of the observer.
The Op Art artist Sonia Delaunay’s creations in the 1920s :
Op Art fashion :
Sonia Delaunay Spring 2014 :
Op Art in black and White :
Colorful Op Art !
Sixties Op Art :
Fifties Op Art :
Sources : Pinterest and registre-des-arts