My invisible friend, more real and visible than my very self.
-- Narrator (Part I: Chapter 4)

Importance: At the start of the novel, G.G. attempts to describe who Gaustine is. However, the more he attempts to do so, the more obscure Gaustine's character becomes. He is indeed G.G.'s fictional creation. Yet Gaustine is also indistinguishable from G.G. himself. Although G.G. has yet to fully acknowledge and confess that his fictionalized protagonist is a manifestation of the person he wants to be, this moment foreshadows the ways in which their identities will blur over the course of the chapters to come.

Yes, rooms of the past. Or a clinic of the past. Or a city...Are you in?
-- Gaustine (Part I: Chapter 10)

Importance: In the early chapters of the novel, Gaustine attempts to include G.G. in his clinic of the past project. In this scene, G.G. and Gaustine engage in a conversation about the idea...