Paul Klee is one of the most ingenious and versatile artists of Classical Modernism, who made experimental use of many of its styles (Expressionism, Constructivism, Cubism, Dada, Surrealism) without committing himself anywhere - with the exception of his friendly relationship with colleagues of the Blaue Reiter. As for Kandinsky, Klee later had a formative teaching career at the Weimar, then Dessau Bauhaus. The trip to Tunisia with August Macke and others was decisive for his artistic self-image. In addition, Klee developed a significant production of art-theoretical writings that can be focused on the following formula: "Art does not reproduce the visible, but makes art visible." In unbridled creativity, a fantasy-drenched oeuvre emerged that was marked by highs (1939: 1250 works) and lows (1936: 25 works). By 1920 at the latest, Klee had achieved considerable fame, but personally, the passage of time - being arrested in the Third Reich, denied Swiss citizenship in his own country, and a long illness that ultimately led to his death - thwarted the career he would have deserved throughout his life. Today he is one of the most important artists of the 20th century.