Abstract Expressionism was an American post-World War II art movement between 1946-1960. It was characterized as spontaneous, focusing on the inner psyche through unconventional and informal abstract works using energetic gesture, as seen in works by Jackson Pollock, Willem de Kooning, Mark Rothko, and Franz Kline. The artists asserted that subject was critical and they aimed to create adventure into imagination through fancy-free works opposed to common sense.