I dreamed I opened a book with pages tipped in green. Everything alive must die, it said. That’s a rule. And there’s a limit to our physical size. That’s a rule, too. But there was an appendix, lists of classifications narrower than species. Smaller and smaller names for angels or atoms, dominions and principalities. Here’s the very last page, where we’re all the way down to the little categories of shuffles and coincidences.