Important Swiss-German artist (1879–1940) whose works incorporate a number of the most influential movements of the day, including surrealism, expressionism, and cubism. ALS in French, one page, 4.5 x 7, no date, but postmarked September 25, 1911. Letter to the collector of Klee's art, Marie von Sinner in Bern-Engried. In part (translated): “I forgot to mention that my exhibition will last until 1st October. Entrance is free. This will most likely bring Sasha to visit the exhibition again.” Accompanied by the original mailing envelope, addressed in Klee’s hand. In fine condition, with paperclip impression to top edge, and a few light creases. Envelope is torn at top right. RRAuction COA.