Benjamin Cañas ( 1933 - 1987 ) was a Salvadorean painter. Benjamin Cañas s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 12000 USD for El angel guardian in 2003 to 60000 USD for The Nightwatch of Dr. Kauffman in 2005 , based on the size and medium of the artwork.