  The dominant interpretation in traditional China is that Dao represents the source of the original, undifferentiated, essential qi-energy, the “One,” which in turn produces the yin and yang cosmic forces. While the “lighter,” more rarefied yang energy-stuff rises to form heaven, the “heavier” yin solidifies to become earth. A further “blending” of the two generates a “harmonious” qi-energy that informs human beings.