A staff member arranges an artwork in an exhibition for the auction of Casa Morton in Mexico City, capital of Mexico, Aug. 17, 2015. A total of 237 works of plastic artists including Andy Warhol, Amedeo Modigliani, Pablo Picasso, Juan Soriano and Rufino Tamayo will be auctioned on Aug. 20 in Mexico City. (Xinhua/Pedro Mera)
