World Expos, which are held once every five years, normally run from May 1 through October 31. Given the summer heat in the Persian Gulf, the 2020 Dubai Expo was scheduled to open in October. Then the pandemic led to a year’s delay, which was a godsend for countries – including the U.S. – that hadn’t finished their installations on time. Still labeled Dubai 2020, the Expo is now expected to open its gates on October 1. And what gates! The British designer Asif Khan created a trio of portals made of carbon fiber threads (enough to reach from here to the sun) wound by robots into elegant latticework panels. Doors as high as a six-story building will swing open and closed at the start and end of every day.