It's eighty years today from the picture taken by photographer Charles Clyde Ebbets on the building site, "up in the sky":

http://en.wikipedia.org/wiki/Lunchti...p_a_Skyscraper

http://www.repubblica.it/spettacoli-...1/?ref=HRESS-2

This small caption says the photographer was the official photographer of the building firm and - who would have thought it - the picture was somehow staged.

This is one of the pictures that really remained impressed in my mind when I saw it first, while a child.