They’re coming your way ON THE outskirts of Guangzhou, a city in southern China, lies an abandoned park filled with crumbling replicas of the wonders of the world. To the right are fading golden spires that are meant to represent Angkor Wat, a temple in Cambodia. On the left, a row of dusty Egyptian statues towers over a desolate Greek amphitheatre. Adding to the surrealism, the tops of the trees have been lopped off and a buzzing noise fills the night air. This strange place is the testing ground for EHang, a Chinese startup that makes drones. (The treetops were chopped off, an employee explains, because drones kept crashing into them.) Hu Huazhi, EHang’s founder, is beaming. His firm has just set a world record for a drone-swarm light show in Guangzhou, where it flew a thousand small drones in perfect unison. Next it plans to launch an autonomous flying-taxi service with a giant drone big enough to take a person (pictured). Dubai has just signed a deal with EHang to launch drone taxis this summer. EHang is an example of a new kind of Chinese firm, labelled “micro-multinationals” by some. In the past,...