Experimentation led to Dalí's first Surrealistic period in 1929. These oil paintings were small collages of his dream images. His work employed a meticulous classical technique, influenced by Renaissance artists, that contradicted the "unreal dream" space that he created with strange hallucinatory characters. Even before this period, Dalí was an avid reader of Sigmund Freud's psychoanalytic theories. Dalí's major contribution to the Surrealist movement was what he called the "paranoiac-critical method," a mental exercise of accessing the subconscious to enhance artistic creativity. Dalí would use the method to create a reality from his dreams and subconscious thoughts, thus mentally changing reality to what he wanted it to be and not necessarily what it was. For Dalí, it became a way of life.