After seeing this, I finally created the post category "bookshelf furniture." This is the fourth such piece I've found in the last few months.
From Treehugger's "Bookinist: Crazy/Clever Chair for Reading, Thinking, Moving"
Bookinist [from designer Nils Holder Moorman], a combination chair/bookcase with a reading light, cup holder, and a more few surprises that combine to give new meaning to the term "bookmobile." The arms and backrest can hold 80 paperbacks, and the chair hides secret compartments for reading glasses, bookmarks, pencils, a pencil sharpener and a notebook (all included with the chair) and adds and a wheel for easy mobility...
Designers continue to innovate in order to maximize space and keep books as close to their readers as possible. This 21st-century furniture design makes me think of a certain 20th-century "glass house." While we're warned not to throw stones there, traditional wall bookshelves blocking the natural light and obstructing 360-degree views would also damage its design. This type of furniture would fit in well.
If you desire to furnish your abode with all sorts of furniture that second as bookshelves, check out the other pieces —all from different designers — that I've found so far:
There will be more bookshelf furniture to come. I think this design sub-field hasn't been fully explored yet.