A book-shaped hole

This blog post by Alastair Reynolds is a great contribution to the whole "Is SF exhausted" debate, but what I really loved about it is that it articulates better than ever why I write what I write -- because, as Reynolds puts it, he sees "a book-shaped hole where one ought to be," something he thinks ought to exist that nobody else is doing. It's a way of looking at it that I find comforting as I slowly begin the process of writing another unsellable book.