Christo and the late Jeanne-Claude are famous for their large-scale public art installations. The Gates, for example, occupied 23 miles of pathways in New York’s Central Park. Lesser known is the couple’s shared birth date: June 13. This year, less than a week after his 83rd birthday, the unofficial summer of Christo in London begins. June 18 marks the debut of the temporary floating sculpture The Mastaba (Project for London, Hyde Park, Serpentine Lake), Christo’s first outdoor, public work in the U.K. A continuation of a similar installation the duo proposed in 1977 in the United Arab Emirates, it’s composed of 7,506 stacked steel barrels painted red, blue, white, and mauve—“royal colors,” according to Christo. Then on June 19, a few steps away on dry land, “Christo and Jeanne-Claude: Barrels and The Mastaba 1958–2018” opens at Serpentine Gallery.