" All across the multiverse there are backward tribes* who distrust mirrors and images because, they say, they steal a bit of a person's soul and there's only so much of a person to go around. And the people who wear more clothes say this is just superstition, despite the fact that other people who spend their lives appearing in images of one sort or another seem to develop a thin quality. It's put down to over-work and, tellingly, over-exposure instead.

*Considered backward, that is, by people who wear more clothes than they do. "

― Terry Pratchett , Witches Abroad (Discworld, #12; Witches #3)