Two other odds and ends:
1. Someone in the past asked about the Neighbor named Horn. I assumed that the Neighbor was honoring Horn by taking Horn's name as his own.
2. Which brings up another point that I don't recall seeing discussed. Horn says that the Neighbors have a weird sense of humor, as he found out repeatedly. Now, that would seem to be a CLUE about later events, but what events? My first guess is the various astral projections, which is something we know that Neighbors do, and which Horn becomes able to do. But only with an inhumu/a present (?). Which brings up the question of whether Neighbors and Inhumi are the "same" somehow. Are the inhumi, in fact, a Huge Joke of the Neighbors?
Patera Nutria
*This is WHORL, for discussion of Gene Wolfe's Book of the Long Sun.