One of the most common is the custom of hanging a mirror, turning it against the wall, or even taking it out of the room where the deceased person was.
Most often, the danger of an open mirror is explained by the fact that the reflection of the deceased in the mirror, that is, his "doubling", threatens a repetition of the death in this house.
There is an old belief that the soul of a deceased person can enter the mirror and remain trapped in it. And if this mirror is in the house or is given to someone, then big trouble should be expected here.
Usually such a mirror is not difficult to recognize: it is cold to the touch and a church candle is extinguished in front of it. Nothing can save such a mirror from the curse. Even spiritual cleansing is powerless here. There is only one way out: break the mirror and release the soul of the deceased outside.
Serbs, for example, believe that the next victim will be the one who first looks in the mirror after the death in the house. Therefore, they have a custom: in order to prevent misfortune, you must first bring the cat to the mirror so that it can see itself.
Along with the danger of a repetition of death, many people are guided by the fear that the deceased will "return" to the house he left if his image remained in the mirror.
Most older people believe that any mirror is a door to the other world through which souls can pass. Some believe that the deceased can "drag" the soul of a living person into the other world, others say that the deceased's thirst for life can lead him through the door-mirror into the world of living people; still others assert that dangerous astral beings can enter our world through this Door.
Other explanations are also possible. Some mystics claim that “from there,” from the Looking Glass, we are watched by those who have already passed away or are just leaving it. In this case, the distance does not matter. The soul of a dying person, consisting of subtle matter, can manifest itself in a mirror thousands of kilometers away. Here's one example:
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TO. Reitz, a 23-year-old resident of Munich, returned from a walk in the park, stood in front of a mirror and tidied herself up. And suddenly, with horror and amazement, she noticed that a man was watching her from the mirror, whose facial features seemed familiar to her. The girl turned around, looked around the room - there was no one in it.
In the evening, telling her mother about what had happened to her, she suddenly remembered whose face she had seen in the mirror. It was her uncle, who had gone abroad to work a few years ago. Mother and daughter decided to write him a letter and tell him about a strange hallucination.
However, the next day, a telegram arrived informing of the untimely death of their relative. Death came at the very moment when Clara saw him in the mirror."