A photo-certificate from Dr. Josef Helfenstein and Stefan Frey dated Bern, 30 September 1991 accompanies this drawing, which is recorded as "56 (06)" in the artist's Oeuvre Catalogue.
Among Klee's finest drawings are his architectural constructions, in which he puts aside his customary anecdotal and improvisatory fantasy and takes a more structural and disciplined approach. Indeed, Klee's methods here display his interest in music, and form a linear adjunct to his "color polyphony" (see lot 577). The stepwise ascending and descending forms recall musical scales and passagework, and stem from Klee's love of musical calligraphy. "He wanted to take from his own art some of the delight he found in the graphics of musical composition." (A. Kagan, Paul Klee/Art & Music, Ithaca, New York, 1983, p. 119).