Mirrors have the geomantic function of recreating energy.
I'm sure you've heard that there is a saying in Feng Shui at the entrance. In fact, the mirror has the same feng shui influence on the door and the door, especially if the height of the mirror exceeds half of the height of the door, which is equivalent to creating an opposite feng shui environment. So the mirror can have the geomantic function of recreating energy.
Mirrors have the function of transforming energy into feng shui.
Second, the mirror has the function of transforming energy into feng shui. According to the theory of left green dragon, right white tiger, former suzaku and later Xuanwu in Feng Shui, we need a backer behind our seats to feel safe and practical. What is a backer? That is, leaning against a solid wall. However, if there is a solid wall behind our seat as a backer, but a mirror is installed on the solid wall, then the mirror weakens the role of the backer. So the mirror also has the function of converting energy.
Mirrors have the function of virtual feng shui.
In feng shui, mirrors can't be placed by the bed. Why? Because the bedroom is the most secret place in our life, and the bed is the most private place in the bedroom, from the geomantic theory, these places are forbidden to outsiders. However, because the mirror has the Feng Shui function of blurring energy, when we move in the bedroom, the mirror will also blur the energy of a character, just like "outsiders entering", which runs counter to the Feng Shui theory. This is the role of mirrors in geomantic omen.