 It happened kind of naturally, but I realized that it was a valuable way to think of it. The Fred character in the book is a person that doesn't see the homeless people. In other words, he lives in New York City, but he doesn't realize that there's a subterranean world that they inhabit, that they have sorrow, that they have ecstasy, that they have hunger, that they have despair, that they have lovers. You don't think of it that way. You just see them as street furniture.