Zhou Yi pointed out all things burst out in Zhen, grow neatly in Xun, Li is a symbol of light. In Li,Everything is vigorous and appears to each other one after another.Kun is the symbol of the land. All things try their best to raise on the land, so force acts on Kun.Dui symbolizes happiness.Qian symbolizes the intersection of yin and Yang, and the moment when light and darkness confront each other.Kan, the symbol of water, represents of the north, and also represents diligence, hard work and fatigue. Fatigue of all things must return to rest, so diligence, hard work and fatigue are tired of Kan.Everything is completed in Gen.