Robert Mangold ( 1937 - ) is an American painter. Robert Mangold s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 22593.38 USD for A TRIANGLE WITHIN THREE RECTANGLES in 2003 to a remarkable record 800000 USD for V Series Central Diagonal I (green) in 2006 , based on the size and medium of the artwork.