Imagine that the stage is a box. Cut the box in half and exchange the left and right side of the box. This means that left side of the stage corresponds to the right side of the box and vice versa, and it also means that there is an invisible wall running down the middle of the stage. Got that so far? Do a straight scene in this configuration. If a player leaves the stage, that player has a complimentary player that steps on the other side of the stage to continue the scene as the same character. Remember: if you are on the left side of the stage, you have to face to the left to talk to someone on the right side of the stage. Zen, isn’t it.