The Swiss Surrealist artist Paul Klee (1879-1940) was a key figure in the development of modern art. He was known for his unique style of painting, which combined elements of cubism, surrealism, and expressionism. His works often featured bright colors and abstract shapes, and he was also known for his use of line and form to create a sense of movement. Klee's work has been highly influential in the development of modern art, and his influence can be seen in many contemporary artists.