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epa03905800 A Christie's employee poses for photographers next to an artwork entitled 'Spiral Staircase' by artist Peter Coffin during a preview of the 'Thinking Big' sale at the Sorting Office, a disused Royal Mail postal depot in London, Britain, 11 October 2013. The special auction of major contemporary sculpture and installation, organized by Christie's auction house and the Saachi Gallery, will benefit the Saatchi Gallery's ongoing policy of art education and free admission. EPA/FACUNDO ARRIZABALAGA