Jackson Pollock, 1950. 5.3 m wide drip painting in black, white, and umber. Met Museum, New York.
From Wikipedia
Autumn Rhythm is a 1950 abstract expressionist painting by American artist Jackson Pollock in the collection of the Metropolitan Museum of Art in New York City. The work is a distinguished example of Pollock's 1947-50 poured-painting style, and is often considered one of his most notable works.