After World War One, Freud spent less time in clinical observation and concentrated on the application of his theories to history, art, literature and anthropology. In , he published 'The Ego and the

After World War One, Freud spent less time in clinical observation and concentrated on the application of his theories to history, art, literature and anthropology. In , he published 'The Ego and the Id', which suggested a new structural model of the mind, divided into the 'id', the 'ego' and the 'superego'.