In the 160 or so years since the first skyscrapers were built, technological innovations of many kinds have allowed us to build them to reach astonishing heights. Today there is a 1,000-meter (167-story) building under construction in Jeddah, Saudi Arabia. Even taller buildings are possible with today’s structural technology. But people still don’t really live in skyscrapers the way futurists had envisioned, for one reason: Elevators go only up and down. In the “Harry Potter” movies, “Charlie and the Chocolate Factory” and others, we see cableless boxes that can travel not just vertically but horizontally and even diagonally. Today, that…
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