The Sphere [SEP] material used
and its original location.
Description.
"The Sphere" is high and cast in 52 bronze segments. Koenig considered it his "biggest child". It was put together in Bremen, West Germany and shipped as a whole to Lower Manhattan. 
The artwork was meant to symbolize world peace through world trade, and was placed at the center of a ring of fountains and other decorative touches designed by WTC architect Minoru Yamasaki to mimic the Grand Mosque of Mecca, Masjid al-Haram, in which "The
to cathodically protect metals that are exposed to sea water. A zinc disc attached to a ship's iron rudder will slowly corrode while the rudder stays intact. Similarly, a zinc plug attached to a propeller or the metal protective guard for the keel of the ship provides temporary protection.
With a standard electrode potential (SEP) of −0.76 volts, zinc is used as an anode material for batteries. (More reactive lithium (SEP −3.04 V) is used for anodes in lithium batteries ). Powdered zinc is used in