You're in a room with your friend. You look at a sign on his forehead saying "AOM". There's a mirror on the wall. You can see your friend in the mirror, the sig

You're in a room with your friend. You look at a sign on his forehead saying "AOM". There's a mirror on the wall. You can see your friend in the mirror, the sign on his forehead is now saying "MOA". Nobody turned anything to the mirror, the whole scene is stationary. Why is it "MOA" instead of "VOW"?