Titles
Other times, however, the book is not born out of a though, but rather out of a Title. The most recent work I started on, Coke, Pepsi, and the Will of God (theology), came from the title, not the other way around.
I suppose that, in some ways, the Title is the critical piece of the puzzle that is your work, the most important single element (of course, this begs the question of what a 'single element' is, and that makes its way into Objects, and I could go for pages about that).