" The human mind-we have come to observe-tricks out distinctions in principles of oposition. A man more foul will likely be less benign. A woman with a greedy belly may also be mean with her widow's might. The way a man slakes his thirst and a woman slakes her thirst are not identical, for they thirst for different things.
Perhaps this is why humans rely on the mirror, to get beyond the simple me-you, handsome-hideous, menacing-merciful. In a mirror, humans see that the one is also also them: the two are the same, one one. The menace accompanies the mercy. The transcendent cohabits with the corrupt. What stirring lives humans have managed to live, knowing this of themselves! And so we have made a mirror, and in our foolishness lost it, and the one who set out to reclaim it had never returned. Back into our unexamined selves we slunk, until she arrived at our door. (140) "

― Gregory Maguire , Mirror Mirror