In the Subway’s Hidden Depths, Genuinely Outsider Art

“A vast new exhibition space opened in New York City this summer, with a show 18 months in the making. On view are works by 103 street artists from around the world, mostly big murals painted directly onto the gallery’s walls.” The show, called the Underbelly Project, is in one of the city’s disused subway stations: the art is literally illegal, and the artists – if found out – could be prosecuted for their work.