An art historian, photographer, and art critic, Franz Roh deplored photographs that were derived from painting or pretended to be drawings or charcoal sketches. His writings brought him close to avant-garde artists, who inspired many of his photographs. In 1929 he co-published and co-edited a book, Foto-Auge (Photo-Eye), with graphic designer Jan Tschichold. Asserting that photographs were an effective weapon against "the mechanization of spirit" and one of the world's greatest physical, chemical, and technological wonders, Roh and Tschichold based the book on a film and photography exhibition held in Stuttgart. The book's progressive stance led to Roh's brief imprisonment by the government censors, who forbade him to continue writing. In 1946 he was awarded a professorship at the University of Munich, a position he held for the remainder of his life.