The "evil spirit" in Feng Shui is a general term. Generally speaking, all factors that are unfavorable to residential Feng Shui are called evil spirits.
There are actually three types of evil spirits:
The first type is evil spirits that can be seen or even touched. For example: the evil spirits caused by poorly shaped objects such as house corners, broken mountains, road bumps, iron towers, telephone poles, etc. Hospitals, garbage dumps, and crematoriums form evil spirits. Fire stations, public security bureaus, Yang evil spirits formed by transformers, etc.
The second type is the evil spirit of flying stars that regulate qi without visible images, that is, the 4 unfavorable flying stars in the Nine Palaces:
(1) Two black giant stars, which are disease symbols. Star, the five elements belong to earth, and govern diseases and plagues.
(2) Three Bilu stars, the five elements belong to wood, and they are in charge of verbal disputes.
(3) The Five Yellow Lian Zhen Star, the five elements belong to earth, and govern misfortunes and disasters.
(4) Qi Chi Po Military Star, the five elements belong to gold, it is mainly responsible for disasters such as thieves, first-level official misconduct or surgery.
The above four kinds of flying star evil spirits are usually manifested when orders are lost. Their effects are different, and they all produce a new change due to the restrained relationship with other flying stars after being combined. This change will strengthen or weaken the negative energy it brings.
The third type is the fierce evil formed by the combination of Li Qi and Luantou. Generally speaking, the influence of this evil spirit is quite large. This kind of evil spirit usually appears in the direction of the door and window of the house, because these are the only two directions of the entire house that are connected to the outside world, that is to say, only these two places receive the air and sunlight from outside the house. If the combination of the sharp corner of the house and the house flying star on the window happens to form an evil spirit in regulating qi, the influence of this evil spirit will be even greater. Generally speaking, this kind of evil spirit is more effective. This is the meaning of what is said in Feng Shui: "If the qi is not regulated at the front, the qi will not work, and if the qi is not regulated at the head, it will not be effective."