Michael arad was a nobody. He worked for new york's housing authority, designing police stations. Arod conceived of something simple and beautiful. The task of making it real fell to the port authority. They actually built the original world trade center. As tosee a on time. Bay na mase wegs cati. So i asked the two former port authority executives who oversaw the memorial project,. chris ward and david tweedy, to meet me at ground zero. I wanted to understand what it means to make memory real in the way that he was proposing.