for the sake of reflection

mir·ror (mĭr'ər) Pronunciation Key
n.

1. A surface capable of reflecting sufficient undiffused light to form an image of an object placed in front of it. Also called looking glass.
2. Something that faithfully reflects or gives a true picture of something else.
3. Something worthy of imitation.

A quick and interesting read on mirrors from the fabulous people at designboom