Though he had a vast influence on psychophysics, the actual disciples of his general philosophy were few. Ernst Mach was inspired by his work on psychophysics. William James also admired his work: in 1904, he wrote an admiring introduction to the English translation of Fechner's "Büchlein vom Leben nach dem Tode" ("Little Book of Life After Death"). Furthermore, he influenced Sigmund Freud, who refers to Fechner when introducing the concept of psychic locality in his "The Interpretation of Dreams" that he illustrates with the microscope-metaphor.