Abstract Expressionism was a mid-20th century art movement centered in New York City. Artists applied paint forcefully and non-geometrically to large canvases to express inner emotions and feelings. There were two main techniques - action painting involving dripped and splattered paint, and color field painting using solid fields of color. Pioneering artists included Jackson Pollock, famous for his drip paintings, Willem de Kooning, and Mark Rothko known for his blocks of color. Abstract Expressionism emphasized individual expression and made New York a new center for art.