I suppose, with time, I'll manage to forgive you! 😅

by which they are contained, or to which they comment upon, etc. - this comparable smallness being central to how they work - and so I'd be interested to look at the case of Pale Fire in more detail!

Yes, and poems! I've not read Pale Fire (I've only read about it while working on Bend Sinister), but it sounds like an interesting case insofar as Shade's poem and Kinbote's commentary seem equally weighted (please correct me if I'm wrong!)? Endotexts are usually smaller than the "main narratives"

... or footnotes, forewords or afterwords (so long as they're explicitly assuming a textual form), epigraphs, and so on! I account for their different types ("endotextures") and put forward a theory outlining how they work ("endotextuality") in my thesis too. Thanks for asking!

That'd be because I coined the term in my thesis! It's an umbrella term for the additional, fictional (to us) texts found only within or alongside a novel's main narrative. So letters written by characters, the books they read, fictional (to us) appendices ("The Principles of Newspeak")...

Pleasure to see you, Nicci!!