On flying ships, people could fly not only over their planet. Thanks to a thin air bridge that connected the World with its sister planet, the Upper World, the flying ships could fly there too - to their ancestral home... But from somewhere another planet appeared near their sun... “The story can be both an extended joke and a disguised riddle , and an attempt to look beyond the boundaries of the known, and a dream transferred to paper. All the stories in this collection fall into these categories to one degree or another. But which one? I can argue about this for hours..."Bob Shaw