Gonzalo Martin Calero ( 1952 - ) is a Spanish painter. Gonzalo Martin Calero s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4448.97 USD for Brief golden light; and Fragile sun, at sunset in 2013 to 4636.83 USD for A ray of sunlight through the leaves in 2014 , based on the size and medium of the artwork.