First, we can see ourselves in the mirror, which is a magical place.
Modern science believes that we can see ourselves in the mirror because the mirror can completely reflect light. But when there was feudal superstition, there was not so much science. China believed in theocracy in feudal times, so there were not only theology, but also Yin and Yang studies. According to Yin and Yang studies, the mirror can not only see the present self, but also the past self and the present self, and also see the true self. Isn't looking in the mirror to reveal whether you are a monster or not? Of course, if your magic is really powerful, you can't shine. For example, the Monkey King and Liu Er's macaques.
Of course, besides seeing yourself, you can also see other things around you, such as ghosts and so on. There are other moral things and warning things. Bronze mirrors in Shang dynasty were often put together with turtles, which were both tools for divination by emperors. The mirror has also developed in another direction, that is, the magic mirror, in which you can also ask yourself if it is the most beautiful.
Of course, these are superstitious statements, but I'd rather believe them.
So, why not look in the mirror at the bedside?
Yin and yang experts believe that, first, the bed is a place where people sleep and rest, and people are least prepared when they sleep; Second, I sleep at night most of the time, and the night is the most exhausting time for the sun.
These two aspects constitute that people are most easily disturbed by ghosts when they sleep. If you put the mirror on the bed, if you wake up in the middle of the night, you will see yourself in the mirror. If a ghost passes by at this time and becomes something that appears in the mirror, it will scare you half to death, that is, scare your soul. Scaring souls is not uncommon in rural areas, and children are more likely to appear. Of course, this is the story of Yin and Yang Master. However, as mentioned above, you can see your past lives in the mirror. If you wake up in the middle of the night, what you see in the mirror may not be you now, but you in a previous life or you in hell. It is easy to break through people's psychological defense, so it is not terrible, and even the spirit may be scared away.
Of course, modern science thinks it's because people mess up their hair and clothes when they sleep. If you see a messy you, unlike you at ordinary times, people are easily scared by themselves, because when you wake up in the middle of the night, your nervous reaction is very slow.
Second, the mirror can reflect light, that is, it will reflect light. The mirror can not only see the true side of things, but also reflect something.
You have seen many movies in Ching-Ying Lam, and the Eight Diagrams Mirror in it must be familiar, right? Bagua mirror can illuminate zombies and do harm to them. In ancient China, mirrors were often used to exorcise demons, because they could see the real things and reflect them. In rural areas, even in some urban units, some families may see a mirror hanging in front of their door. In order to reflect those "unclean things" and prevent those "unclean things" from coming in.
However, there is also a problem. In rural areas, there are few other houses in front of one house, so the unclean things reflected return to nature. In cities, the opposite of residents is often residents. If you use a mirror to reflect unclean things, you will often drive them to the opposite tenants, so whether this is true or not, it is very bad for the opposite tenants.
The second problem is that although the mirror can reflect unclean things, it will also prevent the god of wealth from coming in. Because even the god of wealth belongs to the ranks of ghosts and gods. Therefore, blocking the way for the God of Wealth to enter your home is blocking the way to get rich.
So the mirror can't face the door, and it can't be hung on the door.