Jules Olitski (1922-2007)

"Like Noland, Olitski favored concentric configurations that nowhere echoed the rectangle's edges; but while Noland stuck to centered circles, Olitski used concentricity as a way to anchor the whole surface or field - to give a sense of interior - without succumbing to the formality of geometry or symmetry. This 'pinning' allows the edges of an open, expanding field to flap free, as it were, while retaining a sense of completeness or focus."

(K. Moffett, Jules Olitski, New York, 1981, p. 34.)