What is synthetic cubism ?
Post-Second World War American painting called Abstract expressionism included artists like Jackson Pollock , Willem de Kooning , Arshile Gorky , Mark Rothko , Hans Hofmann , Clyfford Still , Franz Kline , Adolph Gottlieb , Mark Tobey , Barnett Newman , James Brooks , Philip Guston , Robert Motherwell , Conrad Marca - Relli , Jack Tworkov , William Baziotes , Richard Pousette - Dart , Ad Reinhardt , Hedda Sterne , Jimmy Ernst , Esteban Vicente , Bradley Walker Tomlin , and Theodoros Stamos , among others .