What do your bookshelves look like, and how do you organize them?

In a recent topic on ~books, I mentioned my own efforts at organizing my bookshelves, and took some pics to showcase that effort... and it got me curious what other Tildes users bookshelves looked like, and what organization methods they use.

So, what do your bookshelves look like, and how do you organize them?

p.s. Feel free to also talk about anything related to this, e.g. what books you like the cover art of, what you do with annoyingly oversized books, ask others about particular books on their shelves, etc... :)