How about groaning laundry rooms and animated films that scare little kids? How about blue mermaids with turquoise chains? By following a few simple rules, we can feel at home amid the alchemical symbolism of Arthur Machen’s “The White People.” A librarian from my childhood confides over my shoulder about the limits of her compassion. She refuses to care, she says, for those who come back sunburned after a day at the beach, likening these latter to hungry ones who refuse to eat. I smile and pretend not to differ, even as I ruminate about what it would mean to approach the Tarot as a book, or the fragments of one.