 IV is a part of Robert Motherwell’s "Je t'aime" series, dating from 1955-1957.The medium for the painting is oil and charcoal on canvas, and the dimensions are 70 1/8 inches by 100 inches.It is an example of Abstract Expressionism, which is a style originated in the 1940s and 1950s in New York in which the artist expresses themselves through unidentifiable forms and through spontaneous acts of creating art.