Naturalism is a movement in theater, film, and literature that seeks to replicate a believable everyday reality, as opposed to such movements as Romanticism or Surrealism, in which subjects may receive highly symbolic, idealistic, or even supernatural treatment.
Naturalistic writers were influenced by the evolution theory of Charles Darwin. They believed that one's heredity and social environment decide one's character. Whereas realism seeks only to describe subjects as they really are, naturalism also attempts to determine "scientifically" the underlying forces (i.e. the environment or heredity) influencing these subjects' actions. They are both opposed to romanticism, in which subjects may receive highly symbolic, idealistic, or even supernatural treatment. Naturalistic works often include uncouth or sordid subject matter. For example, Émile Zola's works had a frankness about sexuality along with a pervasive pessimism. Naturalistic works exposed the dark harshness of life, including poverty, racism, prejudice, disease, prostitution, filth, etc. They were often very pessimistic and frequently criticized for being too blunt.
Writers involved in the naturalist movement believed that actors' lines should be spoken naturally, and that mechanical movements, vocal effects, and irrational gestures should be banished. A return to reality was proposed, with the old theatrical attitudes replaced with effects produced solely by the voice. There was a call to individualise characters, instead of generalising them, to produce characters whose minds and bodies would function as they would in real life. Strindberg's 'Miss Julie' has been said to be an excellent example of this movement, as it involves stress on multiple motivation of action; a departure from the stereotypical depictions of character; and random, illogical dialogue. Strindberg's naturalistic conception of theatre also extends to non-literary aspects of staging such as stage décor, lighting,...