At the Museum of Modern Art in New York City today, actress Tilda Swinton surprised visitors by appearing unannounced in a unique live performance art piece called “The Maybe.” The piece simply displayed Swinton sleeping in a glass box, with only a pair of glasses, a carafe of water, and linen-covered bedding. Gothamist reports that the museum has been planning the performance for seven years and that Swinton first started performing the piece back in 1995 at London’s Serpentine Gallery. Throughout the year, Swinton will perform “The Maybe” at MoMA about six more times but at random times and in different museum locations.

photos by Ming Chen Liao, Jen Chung, Gallerina Off Duty for Gothamist, Ming Chen Liao