Shadows rebel and run free, finding themselves mismatched--palmtree-shadows with joggers, camel-shadows with icebergs, frog-shadows with skiers--until, longing for their familiar forms, they return home.
The pictures were fun for kids, but the story progresses as though all shadows in the world are the same at the same time. Maybe the story takes place on a fragment of a ringworld that rotates around its orbit so that it is the same time of day or night on the whole populated surface at any time.