What are some good ways to display or store books by taking up the least amount of room possible?

What are some good ways to display or store books by taking up the least amount of room possible?

Hey guys, I've been a lurker for awhile now and now that I'm home for the summer I'd like to (or rather need to) revamp my room. I have way too much stuff. What are some good ways to display or store books by taking up the least amount of room possible?
Just an update

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A note on my experience with Ma’dam Wisteria…

A note on my experience with Ma’dam Wisteria…

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I love Blue Salvia

the rest of the room

the rest of the room