Held every two years in a twenty-five-thousand-square-foot park by the Rhine, KölnSkulptur is now twenty years old. The project was set up by fervent German collectors Michael and Eleonore Stoffel, who began inviting curators to commission works for the park in 1997. The idea was that the sculptures from each iteration of the show would remain in the park for two years, after which the next curator would add new ones and decide which of the previous ones should be removed, left in place, or relocated. So in this edition, subtitled “La Fin de Babylone. Mich wundert, dass ich so fröhlich bin!” (