There was a book in the Taliesin library called Evolving Hierarchical Systems by an Old Earth guy named Stanley Salthe. Did you see it?” “No, I must have missed it when I was reading those early twenty-first-century holoporn novels.” “Uh-huh,” said Aenea. “Well, Salthe put it sort of neatly–‘An indefinite number of unique individuals can exist in a finite material world if they are nested within each other and that world is expanding.’ — 568: 8532-8536