Oscar-winning British actress Tilda Swinton transformed herself into a living artwork at New York's Museum of Modern Art, or MoMA, where she appeared unexpectedly inside a glass box as part of her performance work "The Maybe."

Before the astonished gaze of those who went Monday to the famed New York museum, the actress remained on a mattress inside a large glass box on the MoMA's second floor, and, apparently asleep, spent hours there with scarcely a movement.

Dressed in jeans and a light blue linen shirt and accessorized with only a pair of glasses lying near the pillow, Swinton did her performance art starting at 10:30 a.m. and would continue until closing time at 5:30 p.m.

"The Maybe" seeks to preserve the "element of chance," for which the museum in the Big Apple has decided not to publicize this new installation of living art nor distribute pictures or stories about it to the press. It will be repeated "periodically" throughout the year.

Swinton, who won an Oscar for Best Supporting Actress for her role as an ambitious businesswoman in the 2007 film "Michael Clayton," presented this performance art for the first time in 1995 at London's Serpentine Gallery and a year later took it to the Barracco Museum in Rome. EFE