Abstract Expressionism was an art movement which lasted from the late 1940s until the early 1950s. The artists used free, often random, application of paint to create images with no tie to reality. Abstract Expressionism is to art as Jazz is to Mozart. It went far outside the accepted traditions for art. The best known abstract expressionists were Jackson Pollock, Arshile Gorky, and Willem de Kooning. Franz Kline (1910–1962), Lee Krasner (1908–1984), Robert Motherwell (1915–1991), William Baziotes (1912–1963), Mark Rothko (1903–1970), Barnett Newman (1905–1970), Adolph Gottlieb (1903–1974), Richard Pousette-Dart (1916–1992), and Clyfford Still (1904–1980) also share some common assumptions; these artists valued spontaneity and improvisation, and they accorded the highest importance to process. 
It was Robert Coates who coined the term Abstract Expressionism. "Color Field" is considered a mature Abstract Expressionism; like in the works of Mark Rothko, Barnett Newman, and Clyfford Still.