Ad Reinhardt (1913-1967)

"... refreshing experience in color imagery in which simplified areas give free vent to a continuous, flat activity of relationships that rest, unchecked, throughout the canvasesReinhardt works with an interplay of positive and negative areas that are so conceived as to reverse themselves and transcend these elements--positive becomes negative and vice-versa, and the whole settles into a restful presentation of feelings in paint."
(B. Hopkins, "An Ad for Ad as Ad," Artforum, Summer, 1976, pp. 62-63.