I designed and built my own. Available in two varieties. Paperbacks and hardbacks. I swear that just about every book case I've ever looked at is designed by so

I designed and built my own. Available in two varieties. Paperbacks and hardbacks. I swear that just about every book case I've ever looked at is designed by someone who doesn't own a lot of books, doesn't love books, and doesn't really think about books other than things that go on coffee tables or a few shelves. I made my book cases 26" wide, pine for the carcase, maple for the shelves that can be flipped over and work in any direction. 7' 8" tall, which means it will clear a standard height 8ft ceiling in just about any house in the US built in the last 50 years. Book case depth was either 6" deep or 8.5" deep depending on if the book case was meant to hold paperbacks or hardbacks. A single fixed shelf at the one third mark. Shelf pin holes every 1.5". Limited width of shelf means the span won't sag very much, maple has a high Jenka rating, so it doesn't sag as much as composites or fast growth pine. If the maple shelves do sag a bit over time, flip them over and then they can sag back the other way. If the front of the shelf gets dinged up, flip it around. The fixed shelf prevents the carcase from bowing out, and placing the shelf about 1/3rd of the way up permits maximum flexibility in shelf positioning. Interesting side-note, the paint on 30 book cases weighs more than 40lbs.