Moving cities are a fairly hoary old sci-fi trope - I seem to recall they were always cropping up on Doctor Who when I was young, though I may be misremembering.
Philip ReeveSometimes, on our way through the world, we meet someone who touches our heart in a way others don't.
Philip ReeveGodshawk looked surprised, the way that people generally do when you ask them philosophical questions in shrubberies in the middle of the night.
Philip Reeve