This document provides background information on several artists and art movements, including Jackson Pollock, abstract expressionism, Piet Mondrian, De Stijl movement, and differences between fine art and commercial art. It discusses how Jackson Pollock was a leading figure in abstract expressionism and known for his unique drip painting technique. It also summarizes that Piet Mondrian was a significant abstract artist who simplified forms down to primary colors and geometric shapes, and was influential in the De Stijl movement which emphasized these elements of design. Finally, it notes key differences between fine art which is self-motivated expression, and commercial art which is commissioned work for communication purposes.