You spend ten years of your life being trained to do one thing, and you're being taught to think that it's the most serious thing that anyone could possibly do, and then suddenly you find yourself doing something that in some respects is the epitome of frivolity.
A big leather-bound volume makes an ideal razor strap. A thin book is useful to stick under a table with a broken caster to steady it. A large, flat atlas can be used to cover a window with a broken pane. And a thick, old-fashioned heavy book with a clasp is the finest thing in the world to throw at a noisy cat.