But there was something else that the Abstract Expressionists taught us: they began to use something besides the conventional means of art; to want other kinds of paint, or kinds of canvas, or ways of making pictures that weren't the usual ways. Some of the next generation, the Pop Art artists [like Roy Lichtenstein and Andy Warhol, picked up this attitude and began to put actual things into art. We [Morris Louis and Noland] were making abstract art, but we wanted to simplify the selection of materials, and to use them in a very economical way. To get to raw canvas, to use the canvas un-stretched – to use it in more basic or fundamental ways, to use it as fabric rather than as a stretched surface.

pp. 99 – 105 - 'Color, Format and Abstract Art' (May – June 1977)