Bronze footballs,aka soccer balls, are stacked 22 high. Pink aluminum looks like it’s twisted into an enormous pretzel. A cartoonlike character with X eyes stands 20 feet tall. These are just some of the large-scale entities visitors to the 395-acre grounds of Regent’s Park in London are encountering this summer. Artworks by Hank Willis Thomas, John Chamberlain, and Kaws, they are among 22 others for Frieze Sculpture, an outdoor exhibition that launched in 2005 as part of Frieze London. But this year, for the first time, it opens free to the public months before the October 5 fair. The 24 artists hail from around the globe—from Tokyo to Berlin—and the age of the works range from 1989 to new commissions.