Surrealism in the theatre was noticeably less prominent than in the visual arts, centring mainly in Paris in the 1920s. Typical conventions included dream sequences, illogical plots and fantasy elements. This avant-garde theatre movement was beyond realism. Theatre practitioner Antonin Artaud was briefly associated with the surrealists. The form paved the way for future movements such as Theatre of the Absurd. – Justin Cash
Wikipedia entry on surrealism, including a brief section on surrealism in the theatre.