Paul Klee’s artistic legacy has prompted studies that range from art history and aesthetics to philosophy, and they have now matured to the point that they require the construction of a consistent methodology. Klee’s ample talents were expressed not only in his artworks but also in his polemical and theoretical writings and in the mastery of language he exhibited in his renowned Diaries; this makes the question of unity extremely important. What holds Klee’s oeuvre of different forms and genres together, and what lies at the center of his understanding of the world and of art’s role in it? The author argues that the three major aspects of Klee’s approach to art are united by humor of a kind much like the Romantic era’s humor as it was expla...