Created by Claes Oldenberg and installed in front of Van Pelt Library in 1981, the Button is 16 feet in diameter, weighs 5,000 pounds, and is cast in reinforced aluminum. Oldenberg once told the Philadelphia Inquirer that "the Split represents the Schuylkill. It divides the button into four parts — for William Penn's original Philadelphia squares."

Did You Know... "The Button" was this artist's second major outdoor work in Philadelphia; the first was "The Clothespin" (1976), towering over the 15th Street subway station.