Tilda Swinton is on display at MoMA (video)

The actor is sleeping in a box as part of an unannounced performance piece.

On Saturday, visitors to the Museum of Modern Art entered the museum to find an unexpected new piece: a glass vitrine containing actor Tilda Swinton, seemingly asleep.

According to MoMA, the performance work, titled The Maybe, will reappear sporadically throughout the year at locations throughout the museum. And in fact, again without notice, Swinton is back at it today (Mar 25) at MoMA's second-floor gallery. Head there before close to get a glimpse.