The reason why the mirror can't face the door is because people will see the mirror directly after opening the door. If you are not prepared in advance, the person who opens the door may be scared. The so-called "fright" affects people's mood. If you are too afraid, you will make people's nerves fragile, which is called "blessing" for families and people.
Extended data:
The mirror faces the door-the gate: it is mentioned in the mirror geomantic omen that every mirror has its own mirror god, and the gate represents the position of the door god and the god of wealth. If the mirror is placed in front of the gate, the mirror will scare away the door god and the god of wealth, which will affect the career development (superstition is not credible).
The mirror is facing the door-door: Similarly, every inner door has its own door god. Pointing the mirror at the door will also scare away the doorkeeper of the inner door and make the house lose its guard (superstition is not credible);
Mirror facing the door-bathroom door: putting a mirror in the bathroom is the basic decoration that almost every family will choose. The bathroom itself is relatively small, so be careful not to point the mirror at the door. Otherwise, it will affect male function and make women prone to gynecological diseases (superstition is not credible).