Attacks on art have been in the news fairy often in recent months. In July, climate activists glued themselves to a copy of The Last Supper believed to have been painted by Leonardo da Vinci’s students and scrawled “no new oil” beneath the image, and in May, the Mona Lisa made the headlines when a museum visitor smeared cake all over the protective glass that guards the famous painting. That incident was just the latest in a series of attacks on the Leonardo da Vinci masterpiece.