Masking
Curtains, flats, or other scenic elements used to hide backstage areas, technical equipment, and the wings from the audience's view. Masking ensures that the audience sees only what the creative team intends—the illusion of the set—without glimpsing stagehands, stored props, or the bare walls of the theatre. "Legs" (side curtains) and "borders" (overhead curtains) are common masking elements.
