Kai Nielsen ( 1882 - 1924 ) was a Danish Art Nouveau painter from The Golden age of Illustration. Kai Nielsen s works have been put up for auction numerous times, with realized prices greatly surpassing estimated prices, varying from 15029.56 USD for Bokseren Dick Nelson in 2004 to a remarkable record 237297.19 USD for Aarhuspigen in 2019 , based on the size and medium of the artwork.