Tucked in the back of the Philadelphia Art Museum‘s modern galleries is a peculiar, enigmatic piece by Marcel Duchamp. Etant donnes was the artist’s final work*: he spent the final two decades of his life working on the piece after telling the world that he had retired from art-making. Upon his death, the work was discovered and, as per the stipulations of Duchamp’s will, installed at the PMA never to be moved or lent out to other sites.