At that time, Cao Cao thought that he was not as good-looking as people. When foreign envoys visited, people pretended to be Cao Cao and slept in bed to meet people. He acted as a guard. Afterwards, Cao Cao sent someone to test the impression of the messenger. The messenger replied: Cao Cao slept well in bed, but the guards standing beside him were more energetic. Why tell such a story is to tell you that if you want to have a spirit at home, you must first have the ability to test the spirit. You have a unique ability to investigate. You can imagine what an impression a spiritual house is, and then you can make a spiritual house with the advantages of geomantic omen.
The theory of geomantic omen is: Yin takes Yang, and Yang takes Yin. The spirit of all heights, all heights.