Term referring to nongeometric abstract paintings featuring relatively uniform surfaces and no obvious references to directional format or traditional structure. Such compositions generally lack centers of interest and regard for edges. In dripped and poured works of the 1940s, Jackson Pollock ranked as the earliest major practitioner. Other abstract expressionists also made such paintings, as did their contemporary Mark Tobey. More recently, some works by Cy Twombly and others continue the mode.