Karl Plattner ( 1919 - 1987 ) was an Australian painter. Karl Plattner s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1078.17 USD for Zwei Figuren in 2003 to 57129.25 USD for Nächtliches Zwiegespräch in 2006 , based on the size and medium of the artwork.