Ancient geomantic omen: Should the door be open in the sky or underground?

Among the twenty-four mountains in Jiugong Bagua, there are eight in four dimensions and twelve in the earth. The key is to look at the position. Generally speaking, the house in the gossip is used to open the door, and Wangfang is introduced in the middle. Kan, Gen, Zhen, Xun, Li, Kun, Dui, Gan Gai Ren Zi Gui, Ugly Yin, Jia Mao Yi, Chen Si, Bing Wu Ding, Geng, Xu Hai. One purpose is to open Wang Fangna's valve.