Robert Rotar ( 1926 - 1999 ) was a German painter. Robert Rotar s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 370 USD for Triptychon - Der Halleysche Komet in 2004 to 17946.45 USD for ROTATION NR. 30 in 2013 , based on the size and medium of the artwork.