"So what about skyscrapers for dead people that were built down? They could be underneath the skyscrapers for living people that are built up. You could bury people one hundred floors down, and a whole dead world could be underneath the living one. Sometimes I think it would be weird if there were a skyscraper that moved up and down while its elevator stayed in place. So if you wanted to go to the ninety-fifth floor, you'd just press the 95 button and the ninety-fifth floor would come to you. Also, that could be extremely useful, because if you're on the ninety-fifth floor, and a plane hits below you, the building could take you to the ground, and everyone could be safe, even if you left your birdseed shirt at home that day."
(From, Jonathan Safran Foer's Extremely Loud and Incredibly Close)