The Swiss abstract painter Paul Klee (1879-1940) was a prominent figure in the development of modern art. He was a prolific artist who worked in a variety of media, including painting, drawing, and printmaking. His works often featured geometric shapes and bright colors, and he was known for his playful approach to abstraction. Klee's work has been highly influential in the development of abstract art, and he is considered one of the most important artists of the 20th century.