Wouldn’t it be cool to reach into a book and pull out…a working ray gun, or…Harry Potter’s Cloak of Invisibility? In Jim C. Hines’ Codex Born, second book in the Magic Ex Libris series, that’s libriomancy, a magical art invented by Johannes Gutenberg. If it’s in a book, you can get it, with some exceptions. Some writers just have their characters use magic to do whatever they want. The Libriomancer series has a magic system with rules and limits, and there are physical and societal consequences for breaking the rules.