I am making notes for things I might put in a future exhibition of books illustrated in books, as I happen across them. There are lots of depictions of books in medieval manuscripts, but I think this is the first one I've seen where the book has a tiny but recognizable illustration. (The full IRL page is less than six inches tall.) https://nrs.lib.harvard.edu/urn-3:fhcl.hough:753821?n=2
@overholt Who knew medieval monks were into Simpsons memes!
@overholt _The Virgin Mary's Book at the Annunciation_ might include something of interest: https://boydellandbrewer.com/9781843846284/the-virgin-marys-book-at-the-annunciation/.
The Virgin Mary's Book at the Annunciation - Boydell and Brewer

Winner of the 2021 Frank S. and Elizabeth D. Brewer Prize of the American Society of Church HistoryWinner of the 2022 SMFS Best First Book in Medieval Femini...

Boydell and Brewer
@overholt I thought, before I looked, that you had recognised the image as a specific illustration with which you were familiar.
@overholt I have a bunch of photos of books in paintings. Especially ones that show books in shelves and interesting book-holding furniture. Not your exhibition but interesting in how one thought of books in 14th c. etc. Earliest one I've seen is this, Ravenna, ~450. https://en.wikipedia.org/wiki/Mausoleum_of_Galla_Placidia#/media/File:LawrenceRavenna.jpg
Mausoleum of Galla Placidia - Wikipedia