Bridget Riley speaks about rhythm and  repartition in her work.

 “For me Nature is not landscape, but the dynamism of visual forces – an event rather than an appearance – these forces can only be tackled by treating color and form as ultimate identities, freeing them from all descriptive or functional roles.” Bridget Riley.

Bridget Riley, Blaze 1, 1962

you can find more information on:

http://www.mishabittleston.com/artists/bridget_riley/