Keisai Eisen ( 1790 - 1848 ) was a Japanese painter. Keisai Eisen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 550 USD for Autumn Moon, Atago Hill in 2004 to 25000 USD for Courtesan in moonlight in 2009 , based on the size and medium of the artwork.