Op Art. What is Op Art?. a form of abstract art that gives the illusion of movement by the precise use of pattern and color, or in which conflicting patterns emerge and overlap. Bridget Riley and Victor Vasarely are its most famous exponents.
http://www.wikipaintings.org/en/wassily-kandinsky#supersized-featured-189287 -slide showBio.
"Composition VIII". 1923 year
Oil on canvas
New York, The Solomon R. Guggenheim MuseumWassilyKandinsky
What are the principles at play, here?