Wikipedia
The Lehrstücke (plural form; singular: Lehrstück) are a radical and experimental form of modernist theatre developed by Bertolt Brecht and his collaborators from the 1920s to the late 1930s. The Lehrstücke stem from Brecht's Epic Theatre techniques but as a core principle explore the possibilities of learning through acting, playing roles, adopting postures and attitudes etc. and hence no longer divide between actors and audience. Brecht himself translated the term as learning-play, emphasizing the aspect of learning through participation, whereas the German term could also be understood as teaching-play. Reiner Steinweg goes so far as to suggest adopting a term coined by the Brazilian avant garde theatre director Zé Celso, Theatre of Discovery, as being even clearer.