Positions are the results of action. Positions are also very sensitive to time. For instance, an actor can jump, so that temporarily he floats above the stage. However, he has to stay on and above the stage, unlike ghosts.
Some action do not affect the position on the stage, such as standing straight and raising the arm. Other actions change the position, such as walking.
We can use the same technique for modelling change in position that was used in the previous module for action. I hope you will experiment, both with fairly realistic position changes and with ridiculous once.