. . . was found in the wreckage:

"The Sphere" by Fritz Koenig was found amid the wreckage. The former curator of the World Trade Center thinks it might be salvageable.
Photo: The Port Authority of New York and New Jersey

http://www.npr.org/news/specials/response/home_front/features/2001/oct/011016.lostart.html

They should start making a memorial around this sphere (imhpo). Of course, it is up to the people of NYC to vote on it all.

They should also start a petition (if they haven't already) to NOT build this thing (sorry). Unfortunately, it has already been approved by the city and even the former mayor(!). Of course, this was prior to 9-11. The skyline looks different now.

Although eerie, the Towers of Light idea seems fitting.

After what happened, the lives that were lost there, the outpouring of emotion from people worldwide... I don't think it would be fitting to make the entire site (where the two towers once stood) a park or another place of business... at least not right away. Eventually, yes, they should rebuild... hopefully, around that sphere.

Marcia