Pablo Picasso, "The Head of the Harlequin" (1971). Location unknown
She told the Dutch broadcaster NOS that the hype was part of a performance conceived by two Belgian directors. They sent her an e-mail explaining that the anonymous letter was part of the “Genuine Copy” project, dedicated to the famous Dutch forger Gert Jan Jansen. He made fakes for decades and sold them as paintings by Picasso, Klimt and Appels, until he was uncovered in 1994.
According to the BBC