So there’s this guy in Michigan who makes Nietzsche-themed postcards and sends them out to an unknown number of recipients on a weekly (roughly) basis. He’s been sending them to my dad since the early 90s, when my dad published a book on Nietzsche. Each one is numbered, and he’s on 700-something now. Some are just covers of books, others are more exotic. My dad displays them in his office; the postcard of my dad displaying them in his office was, I believe, 649.