Oli Sihvonen ( 1921 - 1991 ) was an American painter. Oli Sihvonen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2700 USD for Yellow Circle-Yellow Squares in 2005 to 37500 USD for Double Matrix Orange - Green (diptych) in 2015 , based on the size and medium of the artwork.