Appropriate Interactions of Yin and Yang

In the view of ancient Daoists, everything, every phenomenon in nature, has two poles–Yin and Yang. According to the ancient classic, Yijing-the Book of Changes, "one Yin plus one Yang, is the Dao." This statement refers to the Dao that first determines itself as Unity (or the One), and then gives birth to the opposites, interdependent, simultaneous, and complementary two aspects, Yin and Yang.  There are so many levels or layers of Yin and Yang in nature and in the universe.  Examples of such opposites/interdependencies include the protons and electrons of atoms, the hydrogen and the oxygen of water, the water and the fire, the lake and the mountain, the sun and the moon,

The east and the west, the day and the night, the heaven and the earth, the male and female of human beings, the left hand and the right hand, the left eye and the right eye, the hands and the feet, the sympathetic nervous system and the parasympathetic nervous system, the left kidney and the right kidney, the kidneys and the heart in the physical body, etc.

In addition, interactions between Yin and Yang give birth to the authentic Qi, the number 3, Vital Energy-VE3.  For example, if a medical qigong practitioner brings his or her hands in front of the chest with palms facing each other, relaxes the neck, shoulders and elbows, uses a soft focus/relaxed mind to pay attention to the right hand and the left hand, slightly waves the hands, and lets the right hand and the left hand interact with each other, the practitioner will become aware of energetic sensation on the palms and between the hands; he or she may feel sensations like magnetic feelings or rubber bands between the hands, or warmth of the palms, heaviness of the arms and tingling or buzzing of the fingers, etc. These new and fresh sensations between the hands are authentic qi, the vital energies created from the interactions of the Yin and the Yang.  Similarly, different vital energies can be produced between kidneys, between elbows, knees, between kidneys and heart and so forth in different stages of medical qigong practice.