Roy Ahlgren ( 1927 - 2011 ) was an American painter. Roy Ahlgren s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 144 USD for Constellation, 1969 and Homage to the Cross II in 2005 to 1545.58 USD for Prismatic in 2012 , based on the size and medium of the artwork.