Bowie was also a painter and artist. He moved to Switzerland in 1976, purchasing a chalet in the hills to the north of Lake Geneva. In the new environment, his cocaine use decreased and he found time for other pursuits outside his musical career. He devoted more time to his painting, and produced a number of post-modernist pieces. When on tour, he took to sketching in a notebook, and photographing scenes for later reference. Visiting galleries in Geneva and the Brücke Museum in Berlin, Bowie became, in the words of biographer Christopher Sandford, "a prolific producer and collector of contemporary art. ... Not only did he become a well-known patron of expressionist art: locked in Clos des Mésanges he began an intensive self-improvement course in classical music and literature, and started work on an autobiography."