An employee poses with artist Gerhard Richter's artwork "Wand (Wall)" in between works by Andy Warhol "Mao" (L) and Alberto Rossi's "Rosso Plastica" (R) at Sotheby's auction house in London January 29, 2014. The works are estimated to sell for 15 million GB pounds (25 million U.S. dollars), 7.6 million GB pounds (12.5 million U.S. dollars) and 3million GB pounds (5 million U.S. Dollars), when auctioned at Sotheby's in London on February 12. REUTERS/Luke MacGregor (BRITAIN - Tags: ENTERTAINMENT BUSINESS SOCIETY)