A Christie's employee poses with a painting 'Abstraktes Bild' by Gerhard Richter, left, and untitled paintings, center and right, by Sigmar Polke on display in an exhibition ... more 
A Christie's employee poses with a painting 'Abstraktes Bild' by Gerhard Richter, left, and untitled paintings, center and right, by Sigmar Polke on display in an exhibition 'Polke/Richter-Richter/Polke' at Christie's Mayfair gallery in London, Thursday, April 24, 2014. The exhibition celebrates two German painters Gerhard Richter and Sigmar Polke by bringing together 65 of their works in a two-man exhibition, almost 50 years since their joint exhibition in 1966 at Galerie h in Hanover, Germany. (AP Photo/Sang Tan) less 
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Associated Press | Photo By Sang Tan
Fri, Apr 25, 2014 3:00 PM EDT