Shock Me, I'm enjoying these mashups you're making!
This is the Chinese box or mirror-facing-mirror effect. Just as Dante tells the story of how his trip through the universe brought him to the point of telling the story of the trip, which has to be told, and so on, and Proust discovers after three thousand pages that he must write three thousand pages about the discovery that he must write, and so on, so Joyce indicates that in ten years he will write the book in which we are told that in ten years, and so on.