What patience it must take to create these. New Mexico–based artist Isaac Salazar carefully folds individual pages to craft what looks like the ultimate pop-up book. He creates initials, spells out words, and shapes images, all out of ordinary books. And, if you really love them, he'll even sell one to you - his Etsy store, BookOfArt, is currently empty, but you can sign up for the mailing list to be notified when new items are added.
For more photos of Salazar's work, you can browse his Flickr here.