In his "Interpretation of Dreams", Sigmund Freud connected them to his ideas on psychotherapy. Dreams, in Freud's view, are forms of "wish fulfillment". They are attempts by the unconscious to resolve a conflict of some sort. Because the information in the unconscious is in an unruly and often disturbing form, a "censor" in the preconscious will not allow it to pass unaltered into the conscious. Freud describes three main types of dreams: 1. Direct prophecies received in the dream; 2. The foretelling of a future event; 3. The symbolic dream, which requires interpretation.