Originally Posted by
bouquin
I agree with your observation on the detachment-big city paradox. As it says on chapter 1 of City of Glass:
New York was an inexhaustible space, a labyrinth of endless steps, and no matter how far he walked, no matter how well he came to know its neighborhoods and streets, it always left him with the feeling of being lost. Lost, not only in the city, but within himself as well. Each time he took a walk, he felt as though he were leaving himself behind ... By wandering aimlessly, all places became equal and it no longer mattered where he was. On his best walks, he was able to feel that he was nowhere... New York was the nowhere he had built around himself ...
I also tend to concur with the idea that it is Black who sets-up Blue to spy on him, that Black is conducting some sort of experiment with Blue as his subject.