When I am finishing a picture I hold some God-made object up to it – a rock, a flower, the branch of a tree or my hand – as a kind of final test. If the painting stands up beside a thing man cannot make, the painting is authentic. If there's a clash between the two, it is bad art.
Bio: Wilbur Samuel Jackman was an American educator and one of the originators of the nature study movement. Shortly after he was born in Mechanicstown, Ohio, his family moved to California, Pennsylvania where he spent his boyhood growing up on a farm.