In The Shadow of the Torturer, the main character Severian goes to a brothel with his friend and fellow torturer Roche. This brothel is called "House Azure". Some strange things happen here; Severian meets the androgyne who runs the brothel, and a prostitute who looks like Severian's old lover/prisoner Thecla.
We learn the nature of some of these things later. In The Citadel of the Autarch, though, we find this line:
Ever since the night I had first seen him, when Roche had brought me to the House Azure (whose odd name I was now, perhaps, beginning to grasp)
What did Severian grasp about the odd name "House Azure"? It resembles "House Absolute", to which it is somewhat connected, but Severian knew that already by this point. Is there something more here?
There's also this quote from The Urth of the New Sun:
As was to be expected, his first thought was that the man was arrayed for a masque, of which there are always several in one part or another of the House Absolute on any given night. Yet he knew none was to take place in our Hypogeum Apotropaic, neither Father Inire nor the then Autarch having much fondness for those diversions.” I smiled, recalling the House Azure.
The reason Severian smiles is obviously that the House Azure is a brothel run by certain people in the House Absolute without the knowledge of the populace; still, might this quote be relevant for my question as well?