DIY INVISIBLE BOOKSHELVEDS THAT DON'T DESTROY A BOOK! You've all seen these invisible bookshelves, right? The books stack horizontally and and appear to just float on the wall. They look really cool, but they can cost a bundle. Fortunately, they're easy and cheap to make from simple L-brackets. A bit of careful measuring and making sure they're level, and you're ready to start stacking.