A fringe group insists—without evidence—that a man has been living inside the city’s beloved “Cloud Gate” for two decades, and says it’s no joke or performance art. Anish Kapoor, Cloud Gate (2006).

Despite the fact that I have seen many, many art shows sanctifying 1920s modernism from seemingly every angle, the “Mouvement Flou” is a new one to me. The term, meaning the “blurry” or “out of focus” ...