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.
Reversing the fan so the blades spin clockwise pushes air up toward the ceiling and warms the room. You usually don't have to worry about determining directionality. Just use the switch and remember: Forward in summer, reverse in winter.