Library of Congress on Instagram: "Welcome to the world of “inclusions,” an ecosystem known to archivists the world over in which they come across all sorts of things readers have purposefully or inadvertently left between a book’s pages. Time passes, the item is forgotten, the book goes to a library or museum and, decades or centuries later, an archivist turns the page to find a talisman. Modern readers do this all the time, using something at hand for an impromptu bookmark — a letter, receipt,