What is the primary reason that Fritz Koeing's sphere is still located near the remains of the two Twin Towers in New York?

The primary reason Fritz Koeing's sphere is still located near the remains of the two Twin Towers in New York is as a symbol of resilience and remembrance in honor of the victims of the September 11th terrorist attacks. The sculpture survived the attacks and serves as a poignant reminder of the tragic events that took place on that day. It has come to represent the strength and unity of the American people in the face of adversity.