Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How many books does it hold?
Document: We also don't have too many large or really thick books. I don't know that the shelves would hold up a lot of heavy books very well...so just be cautious if you have a lot of heavy books! Because this doesn't take up a lot of space however, I think you could buy more than one if you have a larger book collection!
This is really a nice Book Tower. It holds a lot of books, looks nice, and takes little room. It was easy to put together. The package was heavy. But you would expect a bookcase to have some heft to hold that many books. I wish it had been made in USA. The box said China. That's my only complaint about it.
This bookshelf has such a unique look, and it's great for showcasing the books themselves. It's incredibly sturdy, even though I've got it stuffed with as many books as it can possibly hold. Before I purchased this bookshelf, I knew I wasn't going to love the modern, industrial look of the silver paint. My decor is fairly traditional, and if this was a "normal" bookshelf, I would not have bought it.
I love this bookshelf, it is heavy, sturdy and holds so many books. Everybody that comes to my place asks about it.
I get so many compliments on this book shelf. It looks so awesome when it is full of books. Sturdy and well made.
I am a publisher's dream -- I read hundreds (and buy) hundreds of books a year. And many more live in stacks on my floors, which makes me my landlord's nightmare. Hence this book tower...It's remarkably easy to assemble, even for an Ikea-phobe like me. I had it done within 35 minutes.
It went together with absolutely no problems. It even came with a little tool so I did not even have to head to the garage to find something.It is a solid bookcase and I anticipate having it for many years to come. It is a fun bookcase to have on my staircase landing. I have 44 books (various sizes) on it and could put a couple more on the top shelf if I wanted.
This might be the best impulse buy I have made in a long time. Managed to snag it at a lightning deal but would probably pay more for it anyways. This is a really cool way to store tons of books without taking up a lot of space. I have way too many books (is there really such a thing?) and this helped clean up a few stacks I had sitting around.
I am happy to report the metal spine-style book tower is exactly what I needed - it certainly met my expectations - I put it together in no time at all and love the way it looks with all my books displayed on it - I have recommended it to many people already - wish I knew about it years ago - it would be great for children' rooms (they have a shorter version) all in all very delighted with this purchase!
The SEI Metal Spine - Style Book Tower arrived 2 days before expected. It was easy to assemble, and looks wonderful in my loft space. What surprised me most was how many books it holds. It is quite an ingenious design, and looks terrific creating an illusion of books floating along the wall. I had planned to purchase the same style from cb2 but discovered this one priced nearly a hundred dollars less on amazon.
Answer: It depends on what kind of books you put on it - I have art history books, thinner reference books and a lot that are in the 3-400 page range and about 9 long. With my kind of collection, it holds about 70 or so. It basically holds as many books as you could stack to the height of a five foot tall person.