Lot Essay
In 1928 Klee began his own Werkkatalog in which he kept an inventory of all his works from 1918 onwards. He used various classifications throughout to distinguish the value and quality of each work. Sonderclasse, or simply S.Cl, was Klee's highest classification, denoting a work which was, in his opinion, of the very best quality. Klee considered Aeolsharfe worthy of the S.Cl inscription which appears on the mount at the lower left. It is interesting to note that besides denoting a work which could only be sold at a very high price, it was generally these works which Klee chose to keep for himself. A great proportion of them are now housed in the Kunstmuseum, Berne.