A mirror exists not only as an object but as an entity.
The mirror reacts with light to form a reflection on its surface.
The things reflected in the mirror, however, are not quite the same as the original ones. And exist in a world of their own.
Therefore, the mirror is not just a tool for making a reflection of somebody or something,and if we stand in front of the mirror,we will encounter our other face.
The mirror must keep describing something in its own way as long as a light is in it.