Fritz Sonderland ( 1836 - 1896 ) was a German painter. Fritz Sonderland s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1397.11 USD for Postillon d`Amour in 2004 to 6934.31 USD for A boy and girl kissing in secret on a window pane in 2011 , based on the size and medium of the artwork.