A painting attributed to Leonardo da Vinci and representing Mona Lisa is pictured behind a curtain during a preview presentation in a vault in Geneva September 26, 2012. The Mona Lisa Foundation, a non-profit organisation based in Zurich, will present September 27, a painting and historical, comparative and scientific evidence, which demonstrate that there have always been two portraits of the Mona Lisa by Leonardo da Vinci, the "Earlier Version", made 10 years earlier than the "Joconde" that is displayed in Le Louvre in Paris. REUTERS/Denis Balibouse
