As we begin working with wheels, you will notice a curious phenomenon. Although we speak of FOUR (cardinal directions only), there are always FIVE! Within the center of any wheel is the driver, the catalyst, that which activates the wheel into motion. It is always the Universal Life Force Energy that throbs within all forms of life. Without it, we have no life. Likened to a womb, it is from the center that all else is birthed. Depending on the teachings or the nature of each specific wheel, this center may be specified or it may remain unnamed.
This is also true when we are working with EIGHT-wheels (cardinal and non-cardinal directions), the Center is present catalyzing the wheel, and, therefore, we are working with NINE.
If you desire to teach yourself about the wheels, draw a circle with South at the bottom of the circle, North at the top of the circle, West is to the left and East is to the right. The Center is in the middle.