William Paterson Ewen ( 1925 - 2002 ) was a Canadian painter. William Paterson Ewen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4221.55 USD for LIFE STREAM WITH TIME INTERVALS #11 in 2004 to 378334.68 USD for Full Circle Flag Effect in 2008 , based on the size and medium of the artwork.