A man walks past "Approximation (shoebill)", a huge digital print on aluminium of an Internet-photo of a stork-like shoebill bird by Estonian artist Katja Novitskova at the Art Cologne 2015 fair in Cologne April 16, 2015. Some 200 exhibitors from 23 countries are taking part in the 49th Art Cologne, one of the world's leading fairs for progressive, post-war and contemporary art. REUTERS/Wolfgang Rattay