Paul Klee and Wassily Kandinsky are considered one of the most important pairs of friends of the classical modern period. For three decades the two artists were linked by ties of friendship although they always kept an inner distance. Last year their relationship was first investigated in a comprehensive exhibition. This project is being continued in a publication of the correspondence between the two artists. The exchangebetween Klee and Kandinsky concerned mainly organizational questions of their artistic lives: introductions to acquaintances, and relations with the publishing world and the art trade. Their wives and partners – Lily Klee, Gabriele Münter and Nina Kandinsky – as well as Klee’s son Felix also took part in their dialogue. The correspondents showed very differing profiles as letter writers. Klee’s brief statements contrast with Kandinsky’s rhetoric and particularly his wife’s exuberant communicativeness. Substantial portions of the correspondence date back to the beginning of the First World War and to the 1930s, when Klee and Kandinsky were in the process of emigration and depended on the exchange of letters between Berne and Paris. During the Bauhaus period, on the other hand, when they both met regularly, written communication inevitably became less important. Other means of expression throw more light on this period: photographs showing the befriended artists and gifts of art with which they engaged in a subtle dialogue about their artistic convictions. The publication of the correspondence (expected in autumn 2017) will include Klee’s and Kandinsky’s complete correspondence as well as a representative selection from their wives’ and from Felix Klee’s letters. The correspondence will be supplemented by a commented documentation of all photographs and gifts of art.