Fritz Koenig ( 20 June 1924 &ndash; 22 February 2017 ) was a German sculptor best known outside his native country for '' The Sphere '' , which once stood in the plaza beneath the two World Trade Center towers in Lower Manhattan . With its damage deliberately left unrepaired , the sculpture now stands in Manhattan 's Liberty Park as a memorial to the victims of the 11 September 2001 attacks . His oeuvre includes other works , including other memorials
11 September 2001 attacks
September 11 attacks
Fritz Koenig