Nellie Augusta Knopf ( 1875 - 1962 ) was a painter. Nellie Augusta Knopf s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3500 USD for Windy Day on Ogunquit Beach in 2007 to 10000 USD for Day at the Beach in 2014 , based on the size and medium of the artwork.