Interest in the art of insane asylum inmates continued to grow in the 1920s. In 1921, Dr. Walter Morgenthaler published his book "Ein Geisteskranker als Künstler" ("A Psychiatric Patient as Artist") about Adolf Wölfli, a psychotic mental patient in his care. Wölfli had spontaneously taken up drawing, and this activity seemed to calm him. His most outstanding work was an illustrated epic of 45 volumes in which he narrated his own imaginary life story. With 25,000 pages, 1,600 illustrations, and 1,500 collages, it is a monumental work. Wölfli also produced a large number of smaller works, some of which were sold or given as gifts. His work is on display at the Adolf Wölfli Foundation in the Museum of Fine Art, Bern.