What was the first piece of artwork done by Paul Klee?

Klee has been variously associated with Expressionism, Cubism, Futurism, Surrealism, and Abstraction, but his pictures are difficult to classify. He interpreted new art trends in his own way. He was very constructive in his methods and technique. He used different shades of colour while he also used lots of contrast.

Drawings and colourful paintings, many of them humourous.