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Abstract expressionism is a style of painting that emerged in the 1940s and 1950s, and Sutcliffe was one of the artists who helped to pioneer it. The style is characterized by its use of non-representational forms and colors, and its emphasis on spontaneity and emotional expression. Sutcliffe's paintings are often characterized by their use of bold colors and dynamic brushstrokes, and they often convey a sense of energy and movement.