I was fascinated by The Lord of the Rings from about the age of eight and that lasted well into my teens.
Philip ReeveEven tiny children looking at a picture book are using their imaginations, gleaning clues from the images to understand what is happening, and perhaps using the throwaway details which the illustrator includes to add their own elements to the story.
Philip ReeveMoving 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 Reeve