Mirrors are dangerous instruments. We look into them every day - every one of us. What do you see? "Frown into it, and it will frown back at you. Laugh with it, and you will find a kindly companion" says Phil Callaway in his book "Making Life Rich without Any Money".
I've never been too consumed with how I look - after all, it's only once or twice a day I have to look into a mirror. You're stuck with the job of looking at me on a continuous basis.
But mirror's give us great feedback - no facades, just the raw truth of reality.
Unfortunately it only shows the image on the outside.