Between the two World Wars, painting lost some of the raw, modern energy it began the century with and became dominated by two rather philosophical movements, Dada and Surrealism, which arose partly as a reaction to the senseless atrocities of World War I. But artists were also becoming introspective, concerned with their own subconscious dreams: Sigmund Freud's psychoanalytical theories were well known by this time, and painters explored their own irrationalities and fantasies in search of a new artistic freedom.