Visitors to the Museum of Modern Art were treated to an impromptu exhibit on Saturday featuring actress Tilda Swinton (Michael Clayton, The Chronicles of Narnia) napping in a glass box, equipped with only a mattress, pillow, and water jug.

The exhibit, entitled The Maybe, is not the Academy-Award winner's first foray into performance art; she made her sleeping debut for the same exhibit in 1995 in London and Rome. According to Gothamist, Swinton's appearances at the MoMA will occur at random about half a dozen times more for the rest of the year. Each performance will reportedly last the entire day.

The museum had this to say about its newest installation: "An integral part of The Maybe's incarnation at MoMA in 2013 is that there is no published schedule for its appearance, no artist's statement released, no museum statement beyond this brief context, no public profile or image issued. Those who find it chance upon it for themselves, live and in real—shared—time: now we see it, now we don't."

The reasoning behind this exhibit remains unknown, but it has attracted much attention from visitors (and celebrities) alike. Twitter blew up after James Franco and R.E.M.'s Michael Stipe were spotted in the crowd gathered around the box on Saturday.

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