epa05812370 A visitor looks at the painting 'La corde sensible' (1960) by Belgian surrealist artist Rene Magritte (1898-1967) during a preview event at Christie's auction house in London, Britain, 24 February 2017. The artwork is estimated to fetch between 14-18 million British pounds (18-23 million US dollars) and will be sold at Christie's Impressionist and Modern Art Evening Sale auction on 28 February 2017. EPA/HAYOUNG JEON