One of Nietzsche's favorite living poets (the only real Swiss poet in his opinion, Keller was a major Swiss poet and writer, Keller is best known for his novel "Green Henry" (German: "Der grüne Heinrich"). His work is representative of the Realist movement, which sought to depict life and society as they were. Keller's stories often reflect the conflict between individual creative drives and the constraints of society. His novel "The People of Seldwyla" was one of Nietzsche's favorite.