Nude artwork made of marble is acceptable at the Metropolitan Museum of Art; nude artwork made of flesh apparently is not.

On Wednesday, police arrested Kathleen “K.C.” Neill, a model who was posing sans clothing in the museum during business hours for a photo shoot with photographer Zach Hyman. She faces a charge of lewdness, which her attorney calls “ridiculous,” given the abundance of nude sculptures in art museums all over the world.

Hyman, for his part, has been raising eyebrows elsewhere in New York: Allegedly he’s also taken to working in the subway, photographing nude models on trains.

Read more at the Associated Press.