Population trends for the past couple of years prompted some experts to question whether Houston could unseat Chicago as the third-largest U.S. city. And it’s even sparked a little ribbing. This spring, journalists in both cities got into a spirited back-and-forth over which one reigned supreme — including mention of the census count — when Houston announced it was getting its own version of the Bean. Called Cloud Column, Houston’s stainless steel sculpture was created by Anish Kapoor, the same artist who designed Millennium Park’s Cloud Gate, which went up in 2004.