In 1985, the Sohio oil company commissioned Claes Oldenburg and Coosje van Bruggen to design and construct a large outdoor sculpture for its new corporate headquarters in Cleveland, Ohio. The result was Free Stamp, a bold and distinctive installation that captured both a Pop Art sensibility and a connection to the city’s industrial past. Sohio executives approved the design, and work was already underway, when British Petroleum acquired the company. The new owners quickly decided that the...