This undated photo provided by Christie's shows “Prag 1883” by German abstract artist Gerhard Richter that is going on the auction block in New York City. Christie's says the painting is estimated... more 
This undated photo provided by Christie's shows “Prag 1883” by German abstract artist Gerhard Richter that is going on the auction block in New York City. Christie's says the painting is estimated to sell “in the region of $15 million” on Nov. 14. (AP Photo/Christie's) less 
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Associated Press | Photo By Christie's
Fri, Sep 21, 2012 3:08 PM EDT