^*Two decades later, Frank Herbert would write in Chapterhouse: Dune: “Some precious stones could be identified by their impurities. Experts mapped impurities within the stones. A secret fingerprint. People were like that. You often knew them by their defects. The glittering surface told you too little. Good identification required you to look deep inside and see the impurities. There was the gem quality of a total being. What would Van Gogh have been without impurities?”