Blue's obsessive observation of Black becomes an existential exercise. As he meticulously documents Black's every move, he grapples with the fragmented nature of identity. Is Black merely a product of his actions, or is there a deeper, unknowable self beneath the surface? Blue's own identity blurs as he becomes consumed by his role as observer.

The novel is replete with doubles and reflections, starting with the protagonists' color-coded names. Blue and Black become entangled in a strange dance, their lives mirroring and influencing each other. This duality extends to themes of good and evil, truth and illusion, forcing the reader to question the nature of reality.

"Ghosts" is a story within a story. Blue, through his detailed reports, becomes the author of Black's existence. Yet, the act of observation inevitably shapes the narrative, raising questions about the subjective nature of truth and the power dynamics inherent in storytelling.