Imi Knoebel ( 1940 - ) is a German painter. Imi Knoebel s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3009.93 USD for Ohne Titel in 2002 to a remarkable record 409287.87 USD for Revolver I in 2017 , based on the size and medium of the artwork.