Did Marcel Duchamp complicate the question of what exactly constitutes a work of art? Or did he simplify it? “Can one make works that are not ‘of art’?” he pondered. Duchamp did just that in 1917, when he signed a white porcelain urinal “R. Mutt,” titled it Fountain, and said it was art. His joke was a rejection of aesthetics-based academic styles. Duchamp irritated many, but he also had followers, among them the artist Elaine Sturtevant (1924–2014), who built on Duchamp’s valuation of concept over image. Sturtevant repeatedly employed and copied other artist’s styles—in 1998, she even re-created Fountain. This exhibition in Milan presents their work side by side, offering a refreshing contrast to the A.I. generated art that dominates online feeds and the digital landscape. —Maggie Turner