Plaster Line

2019910plaster line a reference point onstage that runs perpendicular to the center line of the stage, usually denoted by the upstage side of the proscenium architerally where the plaster of the wall liessually the plaster line is the upstage start of the architectural elements of the theatre that the audience always seesn some theatres, such as a black box, the plaster line is the back.