Behind them lay pain and death and fear; ahead of them lay doubt, and danger, and fathomless mysteries. - Philip Pullman

Dark matter is what my research team is looking for. No one knows what it is. There's more stuff out there in the universe than we can see, that's the point. We can see the stars and the galaxies and the things that shine, but for it all to hang together and not fly apart, there needs to be a lot more of it — to make gravity work, you see. But no one can detect it. So there are lots of different research projects trying to find out what it is, and this is one of them. ... We think it's some kind of elementary particle. Something quite different from anything discovered so far. But the particles are very hard to detect.

"one thing that I realized early on in thinking about this book, when I found, to my consternation, that I was writing a fantasy. I hadn't expected ever to write a fantasy, because I am not a great fantasy fan. But I realized that I could use the apparatus of fantasy to say things that I thought were true. Which was exactly what, I then realized, Milton had been doing with Paradise Lost. Paradise Lost is not a story of people and some other people who've got wings. It's not one of those banal fantasies that just rely on somebody having magic and someone dropping a ring down a volcano. Paradise Lost is a great psychological novel that happens to be cast in the form of a fantasy, because the devils and the angels are, of course, embodiments of psychological states. The portrait of Satan, especially in the Temptation scene (I think it's in Book 9), is a magnificent piece of psychological storytelling.

So it was possible to do, I realized, and with Milton as my encouragement, I launched into this book — which I reluctantly accept has to be called a fantasy. Finding physical embodiments for things that were not themselves physical was one of the ways I approached what I wanted to say. But then, that's what we do with metaphor all the time. That's the way metaphor works. The way metaphor works is not the way allegory works. Allegory works because the author says, "This means so-and-so, that means such-and-such, and this can only be understood in such-and-such a way. If you don't understand it like this, the book won't work."

It seems to me that some critics of mine, from the religious point of view, are treating my novel as if it were an allegory and they had the key to it. It is not an allegory, and they don't have the key to it, because there is no key apart from the sympathetic and open-minded understanding of the reader."

There are some themes, some subjects, too large for adult fiction; they can only be dealt with adequately in a children’s book. In adult literary fiction, stories are there on sufferance. Other things are felt to be more important: technique, style, literary knowingness… The present-day would-be George Eliots take up their stories as if with a pair of tongs. They’re embarrassed by them. If they could write novels without stories in them, they would. Sometimes they do. We need stories so much that we’re even willing to read bad books to get them, if the good books won’t supply them. We all need stories, but children are more frank about it.