"I've got a nice comfy library with 7 built-in bookcases made of maple, a lot of art, and a secret door in a photo niche that leads into a theater. Most of the shelves have modern books. There's a science fiction section, medical/biology, text books, etc. The one above has a lot of 19th century science and engineering books. That's kind of my thing. Another case has other 19th century things like history and literature sets."