The ancients thought that the mirror could "ward off evil spirits", mainly because it had the function of reflecting light. The so-called unfavorable "suffocation" can be reflected. In modern houses, indoor mirrors should not face the buildings and corners with sharp corners, because it is at least visually uncomfortable. Of course, if there are beautiful scenery outside, you might as well "inhale" it indoors with a mirror. There is also a view that indoor mirrors "should be dark but not bright" and should be hidden indoors, not in direct sunlight or light, so as to avoid too strong light radiation, which is not good for people's health.
No matter in the countryside or in the city, there is a bad phenomenon gradually, that is, on the top of the gate, many people hang a round mirror, including a general mirror or a gossip mirror. In fact, this is a big taboo. The function of the gate is to receive the skylight. Before hanging the mirror, the gate receives the light of nature and can enter the house. But if you hang a mirror on the top of the door and all the light is absorbed there, it is possible to fold a kind of light itself. In this way, light and gas can't enter the gate. Most people will hang a mirror on the top of the door to stop or melt the evil opposite. In fact, this is all wet. It can be said that it has no effect at all. Therefore, hanging a mirror on the top of the gate is the first taboo.
There can't be a mirror on the ceiling. Modern design is very advanced. I have seen mirrors installed on the ceiling or roof. In fact, it is also inappropriate. If there is a mirror on the ceiling, it is difficult to do whatever you want, and it is easy to see the wrong problem and the wrong person. It's easy for villains to be right or wrong.