'The decision to write a novel is made after a few pages, perhaps before you start writing, but I think the time frame remains the principal factor. That is why this book is a novel, in the end, because that is the way the idea developed and the way I imagined it would spread over time. Sometimes I imagine a new form even more economical than the short story, through which to condense events that are spread out over long periods of time to the greatest extent possible. But all my attempts at achieving this form have been miserable'