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Fritz Koenig's The Sphere/ WTC Plaza - the world's largest bronze sculpture of the time, weighing in at 20 tons. Installed in 1972, It survived the terrorist attacks of 9/11 - dented, damaged.

(Courtesy The Library of Congress/Balthazar Korab 1976)

The artist Rosemary Mayer, who lived at 55 Leonard St., (Tribeca) NYC (not far from Ground Zero), once told me of a possible exhibition that was discussed among the first artists to inhabit Soho and Tribeca sometime in 1972.  It was to be about how Lower Manhattan would be impacted if The Twin Towers "fell." Would they fall North, South, East, or West? What area(s) would be hardest hit? What would the loss of life and business be? How long would a clean up take and who would do it? 

They imploded, they went downward. Clean up took a year plus and it was done by NYPD (incl. K9 units), NYFD, countless volunteers and cadaver dogs.

(Map of impacted zones 9/11 courtesy Fire Heroic American Community of FB)