This piece originally appeared in Reuters Magazine.
Zhang Yue fondly caresses the blueprints as he slowly flips through them, occasionally pausing to stare at a drawing as he explains his new project. The plan seems impossibly ambitious: build a 220-story building, the tallest in the world, in just four months by using the rapid-construction techniques his company has developed. Zhang, a slight but wiry and intense man of 52, says “Sky City” – as he has dubbed it – can fix many of the world’s pollution, congestion, transportation and even disease problems by completely purifying the tower’s air. The 838-meter-tall building (10 meters taller than the Burj Khalifa in Dubai, currently the world’s tallest) will hold schools, a hospital, 17 helipads and some 30,000 people. It will, indeed, be a city in the sky.