Karel René (natus) Callewaert ( 1893 - 1936 ) was a Belgian painter. Karel René (natus) Callewaert s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 845.49 USD for Karel Ren√© "Natus" Callewaert in 2006 to 1097.53 USD for Place anim√©e sous la neige in 2014 , based on the size and medium of the artwork.