When David Childs of Skidmore, Owings & Merrill unveiled the final design of the Freedom Tower last June, Daniel Libeskind, the putative planner of the World Trade Center site, was quoted by the New York Times as saying, "With further refinement it can become an icon for the city." The 102-story skyscraper will certainly be hard to miss, but will that be enough to make it an icon? And what is an iconic building, anyway?