Composition refers to the organization, arrangement, and combination of objects within the borders of a drawing space. For a great drawing, you want to bring the eyes of the viewer toward your center of interest within an aesthetically pleasing composition.
The idea that clockwise motion represents the forward motion of time so powerful that it's hard to look at such a watch or clock without having the slightly unsettling feeling that time is running backwards.
Horizontal Undulatory Progression or Lateral Progression for short. This method of movement is accomplished by the snake lashing it's body back and forth causing lateral waves that force longitudinal motion. To put it another way: They go forward by moving sideways. So imagine a person jumping in diagonal leaps.