Why does the geomantic formula say that the house has three auspicious rooms and four evil rooms?

There are water one, fire two, wood three, gold four and earth five in the five elements. Three genera of wood, the main health. The fourth room belongs to gold, and the Lord kills it. So, three lucky, four fierce. In addition, the door of the house is an air vent, such as a person's nose and mouth, which should be centered. China's philosophy pays attention to the coordination of Yin and Yang. Symmetry left and right. The four rooms are asymmetrical and lack aesthetic feeling.