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In page The Sphere:

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The piece was commissioned by the owner of the World Trade Center, the Port Authority of New York and New Jersey (PANYNJ), in 1966. The Authority's original choice had been Henry Moore, but Koenig was chosen after architect Minoru Yamasaki saw some of Koenig's work at the Staempfli Gallery in Manhattan.[1] Koenig started work in 1967 while the WTC was in the planning stages, and finished it four years later.[2] Originally titled Grosse Kugelkaryatide N.Y.[a] by the artist,[2] the sculpture was soon referred to as The Sphere.