prāṅmukho darpaṇamavalokayan katham iva pratyaṅmukho bhavati / nahi tasya tadā pṛṣṭhābhimukhaṃ mukhamupajātaṃ dṛśyate //
Again, when [someone] facing east looks at a mirror, how indeed does he appear as facing west? For surely no face is seen to have been produced facing his back at that time.