Half Space is a venerable handle that is used to manipulate an open scene. There is an initial reference scene that the performers create. The host then indicates that the scene will be take place again but in half the stage space.
The players in the scene are encouraged to imagine that the floor of the room is balancing on a fulcrum in the center of the room. If a scene involves one player, they can only stand in the center of the floor. The leader may mark the center of the stage with a safe prop. If the player were to move away from the center of the stage the stage would tip, and she would fall off the stage. If the first player in the scene moves across the stage another player must jump into the scene to keep the stage balanced. The players must keep a balanced distance away from each other.