A loosely woven material used on stage, often to represent glass or some other transparent substance. If lighting is thrown on the front of a scrim drop, with no lighting behind, it becomes opaque. If lighting on the front is reduced and the scrim is lit from behind, it becomes transparent to the audience. Lighting can therefore be used to "remove" a wall and permit the audience to see the action on the other side, while understanding that they are seeing "through" the wall. An example of this can be seen in South Pacific during the follies when backstage area of the follies plays downstage in front of a scrim and the actual "performance" takes place upstage, behind the scrim. By changing the lighting, the scene can be shifted from action taking place "backstage" to that "onstage".