Murakami: "Let’s call the world we actually have now Reality A and the world that we might have had if 9/11 had never happened Reality B. Then we can’t help but notice that the world of Reality B appears to be realer and more rational than the world of Reality A. To put itin different terms, we are living a world that has an even lower level of reality than the unreal world."

apparently a good overview of the genre

fictional blog about the Trojan War