<P> Naturalism, for him, implied the indiscriminate reproduction of the surface of life . Realism, on the other hand, while taking its material from the real world and from direct observation, selected only those elements which revealed the relationships and tendencies under the surface . The rest was discarded . </P> <P> As used in critical literature today, however, the term Naturalism has a broader scope than that, within which all of Stanislavski's work falls . In this broader sense, Naturalism or "psychological realism" is distinct both from Socialist realism and the critical realism developed by the epic theatre of Bertolt Brecht . </P>

When did nonrealistic forms of theater really start to challenge realism