In astronomy, Xuanwu was originally the image of seven nights, cows, women, empty, dangerous, houses and walls in the northern sky. In feng shui, it refers to the cave or the mountain behind the house.
Feng Shui experts believe that Xuanwu Mountain should bow down and worship, and the mountain gradually hangs down to the cave to meet the burial cave. Guo Pu said in "Buried Sutra": "Xuanwu hangs its head." Note: "If you hang your head, you will gradually descend from the main peak. Being buried by others, the acupoints will not be watered, and you can sit safely. " When the water pours, it pours, and when it can't stand, it becomes a place to meet diarrhea. "marrow essence" says:' people can sleep in the mountains, and the hall can be filled with water to ensure safety.' It also has its meaning. "
In fact, the requirements for Xuanwu, like Qinglong, Baihu and Suzaku, should all bow down and embrace all beings. Hold your head high, you will be ruthless and fierce. If there is no Xuanwu Mountain, the wind blows before and after, and the gas does not gather, which is the base address.