SINGAPORE - APRIL 11:  The skytrain rides past the Rain Vortex at the Jewel Changi Airport on April 11, 2019 in Singapore. Officially opening on April 17, Singapore's Changi Airport Jewel includes a 40-meter indoor waterfall contained under a steel-and-glass dome reportedly built for SGD 1.7 billion. (Photo by Suhaimi Abdullah/Getty Images)