POP ARTIn the 1950s, a young man from Pittsburgh named Andy Warhol was earning a comfortable living as a commercial illustrator in New York City. But his ambitions went well beyond that; soon he was painting Coca Cola bottles and filling a gallery with paintings of Campbells Soup cans. He certainly wasnt the first to make a Pop work, but Warhol soon became a brand name himself, synonymous with the new art form that embodied everything youthful, subversive,