The Principle of WON (circle)
The principle of the circle is greatly emphasized in HapKiDo. The circle symbolizes such concepts as totality, wholeness, original perfections, self-containment, the self, infinity, eternity, space, timelessness, endless movements, flow, perfect unity, oneness, fulfillment, the cycle of nature and the universe, totality of existence, enlightenment, and the Do. Circular techniques and movements are effective because they harmonize one with one's opponent, one's self with the universe.
Every person has his or her own circle. Inside the circle is their private territory or space. If someone were to enter this private domain without approval or proper warning, each person has a right to defend against this invasion or violation. In actual practice, when an opponent punches, if this punch does not trespass into one's circle, there is no need to block. If one chooses to block, it is considered a waste of time and energy.
When an opponent's attack does penetrate one's circle, it should be received indirectly. Leading this force in a circle minimizes its effect. Utilizing a circle or winding block not only disrupts the opponent's force, but also sets the position for a counterattack. Furthermore, adhering to the circle principle allows one to continuously counter and maintain power and balance. Countering with techniques that are directed at an opponent along a straight line and then returning along the same line will prove to be less effective.
Once flow is mastered, the martial artist can be as soft as the still air, able to elude anyone's grasp, or as devastating as a whirlwind raining countless blows against an opponent.
-Grandmaster and Professor Jhong Uhk Kim
You and your opponent are one. There is a co-existing relationship between you. You co-exist with your opponent and become his complement, absorbing his attack and using his force to overcome him.
-Bruce Lee