Abstract artist Paul Klee was a Swiss-born painter, printmaker, and draftsman who is considered one of the most influential modern artists of the 20th century. He was associated with the German Expressionist movement and was known for his unique style of abstract art that combined elements of cubism, surrealism, and expressionism. His works often featured bright colors and geometric shapes, and he was also known for his use of line and form to create a sense of movement.