" For Werner, doubts turn up regularly. Racial purity, political purity—Bastian speaks to a horror of any sort of corruption, and yet, Werner wonders in the dead of night, isn’t life a kind of corruption? A child is born, and the world sets in upon it. Taking things from it, stuffing things into it. Each bite of food, each particle of light entering the eye—the body can never be pure. But this is what the commandant insists upon, why the Reich measures their noses, clocks their hair color. The entropy of a closed system never decreases. "

― Anthony Doerr , All the Light We Cannot See