In 2004, a urinal was voted the most influential work ever in modern art. Famed artist and provocateur Marcel Duchamp claimed to have created “Fountain”—or rather, he bought the mass-produced product and signed it—but according to some, it is the lesser-known, flamboyant Dadaist artist Baroness Elsa von Freytag-Loringhoven who should take credit for transforming this much-discussed porcelain “piss pot” into art.