Bulgarian-born artist Christo Vladimirov Yavachev known as Christo gestures as he talks to the media in front of his installation "Four Store Fronts Corner" (Parts VI, III, II and I) from 1964-65 ahead of the opening of the exhibition "Christo" at the Galerie Gmurzynska art gallery in Zurich, Switzerland April 19, 2018. REUTERS/Arnd Wiegmann