Among the five elements, water is one, fire is two, wood is three, metal is four, and earth is five. The three rooms belong to wood and govern life. Four rooms belong to gold, which means killing. Therefore, it is said that three rooms are auspicious and four rooms are unlucky. In addition, the door of the house is the air opening, just like a person's mouth and nose, which should be centered. Chinese philosophy emphasizes the coordination of yin and yang. Symmetrical. The four rooms are asymmetrical and lack beauty.