Surrealism emerged in the 1920s as an artistic movement that sought to free the imagination and tap into the unconscious mind. Artists used techniques like automatism to create works without rational thought and reveal hidden meanings. Major surrealist artists included Joan Miro, known for his biomorphic shapes and bright colors, Max Ernst, who invented new techniques like frottage, and Rene Magritte, whose works featured recurring symbols and dream-like scenes. Freud's theories of the unconscious also influenced surrealists to explore dreams and symbols in their artistic works.