Very efficient indeed! I would guess the wide bottom shelves hold double rows at least. If I use my own meagre collection of not even 1000 books as a guide, I w

Very efficient indeed! I would guess the wide bottom shelves hold double rows at least. If I use my own meagre collection of not even 1000 books as a guide, I would estimate that that room can hold about 20000 books if used as efficiently as possible. That room looks blissfully comfortable.