I see a pose as a simple component of a skilled action. The pose identifies four parts that are required for skilled action. There must be an environment such as the stage that provides the context in which the action takes place. There is the physical structure of the actor doing the action. There are the joint angles that describe the geometric relationships between the elements of the physical structure.
I have greatly simplified everything, the stage, the body components of the actor, and the elements of the pose. However, all these pieces are directly observable. In section three I show that it is justifiable to assume an internal information representation that corresponds to the pose, even though this information representation is not observable.
At this point everything is static, there is no time. In the fourth section I focus on action as a transition between poses in time.