Upright locomotion such as walking can be represented geometrically.
The position of the feet are represented by four-sided figures in or just above the plane of the floor.
The position of the hips are represented by a line in a plane parallel to but above the floor.
We can add the position of the shoulders by another line in a plane parallel to but above both the floor and the plane for the hips.
The head, at the level of the eyes, can be represented by a rectangle, where two of the corners represent the eyes, and the middle of the opposite side is connected to the spine.