From the remote depths of the corridor, the mirror spied upon us. We discovered (such a discovery is inevitable in the late hours of the night) that mirrors have something monstrous about them. Then Bioy Casares recalled that one of the heresiarchs of Uqbar had declared that mirrors and copulation are abominable, because they increase the number of men.
Jorge Luis Borges, 'Tlön, Uqbar, Orbis Tertius'
Photo by Saul Leiter, via all things amazing.