He painted on enormous canvases so that the edge of the canvas was not within his peripheral vision and so he was not confined by the edge of the rectangle. (thoughtco.com)
But it was Lichtenstein, working in comic - book style, who had already emblazoned enormous canvases with unvariegated swathes of primaries licked with black outlines against his mechanical dots. (theartsdesk.com)
His experimentations led to the development of his famous «drip» technique, in which he energetically drew or «dripped» complicated linear rhythms onto enormous canvases, which were often placed flat on the floor. (encyclopedia.com)