The postwar period brought major changes and uncertainties as new ideas emerged in science, psychology, philosophy, and the arts. Albert Einstein introduced his theory of relativity, which disrupted traditional views of space and time. Sigmund Freud developed new theories of the unconscious mind. Writers like Hemingway, Fitzgerald, and Eliot captured the disillusionment of the "Lost Generation" after World War I. In the arts, Cubism, Dadaism, and Surrealism rebelled against tradition in their depictions of the inner mind. Women gained new freedoms through fashion, careers, and the right to vote. Technologies like cars, airplanes, radio, and movies transformed society and entertainment.