Okay, first minor "essay," although I guess this is more like a loosely organized string of notes/thoughts:
Re: House of Leaves, I guess I should 'fess up now and say that as I'm rereading, I'm looking at the text from the angle of it being written by Pelafina (and I know, I know, coming at a text with preconceived notions is not a wise way to engage with interpretation; but like I said, I have read it before. And I'm not opposed to shifting tack to Johnny being the author, should the text support that angle more... But that's beside the point).
So, just finished chapter 5, and aside from some notes on the nature and significance of echoes as they relate to the multiple narratives as well as Echo as a symbol, and some thoughts on color (I need to actually go back and find some backup for this, but throughout the story I've noticed that whenever blue is used as a descriptor, it seems to be referring to things that are notably inhuman--which would add some really delicious symbology for "house" appearing in blue... I'm digressing again, but ASIDE from those things, I'm really locked in on footnote 77 (pages 69-72).
This is the footnote where Johnny describes a hallucinatory run-in with a monster in the back room of the tattoo shop, and a subsequent fall down the stairs. He recalls, in phonetic syllables, the Latin phrase "Non sum qualis eram"--or, "I am not what I used to be," a phrase used by Pelafina in her March 7, 1985 letter (page 602). He also describes himself "vanishing," and then reconstituting as he is covered in black and purple ink (purple is P's color, and this could represent her recreating him within the narrative). IIRC, when J has another run-in with the monster later on (and I'll either confirm this when I get to it in the book, or be impatient and look it up later tonight, lol) he describes it as black threaded with purple veins--seeing himself, from this moment, as he is transformed. As he said: "I am not what I used to be."
Now, the question is, what exactly has prompted this transformation? Given my previous knowledge of the book, I know this is part of a progressive sequence of events in which he discovers that he is himself "the Minotaur," but what is it, specifically, about this moment? Was it remembering P's words? Seeing his own reflection? The "dissolution of the self?" Notably, at this point within The Navidson Record, there hasn't been a mention of a beast within the labyrinth, or the Minotaur as a figure yet; this is all going off his own paranoia of "creature darkness," prompted by the claw marks found by Z's body... So is this a sort of free association on his part, or a genuine beginning of a metamorphosis? Or, assuming P is the author, her outside of the narrative beginning to realize that J is her personal Minotaur, the personification of guilt at the center of her own mental labyrinth? Much to think about.
He also mentions his "inevitable asphyxiation" which, in context, refers to the wind being knocked out of him after his fall but could also be in reference to P's suicide by hanging. Again, assuming P is the author, and the Johnny that we are reading is one of her creation, is this a sort of backwards "echo" through time, through (meta) narrative, of P's death? P haunting her own story? The stories layering over one another in a way that defies chronology?
I might be getting a little too metaphysical (?) with it--this is all assuming P is writing in a sort of fugue state (or at least a state that is less than fully intentional--at several points in her letters she mentions having memories of writing a lot, only to discover once she's lucid again that she did not write or send any letters... This could be her writing HOL), and J is similarly "unaware" that he is a character as P brings him to life--adding a double meaning to his "I should be dead" and "why am I still here?"