Audience is one of the four defining characteristics of theater. how does a live audience have an impact on a performance? how did greek theater develop? what elements from greek theater do we still see in modern plays and what elements are now less common? masks were an important part of noh theater as well as ancient greek productions and other styles of theater over the centuries. how can masks be valuable parts of a stage play? why was theater an effective teaching tool for early christians? how can a stage play deliver catharsis?