In this April 7, 2011 photo, Michael Arad, an architect of the 9/11 memorial at ground zero, poses for a picture in front of the ongoing construction at ground zero in New York. Arad first imagined ... more 
In this April 7, 2011 photo, Michael Arad, an architect of the 9/11 memorial at ground zero, poses for a picture in front of the ongoing construction at ground zero in New York. Arad first imagined the twin reflecting pools with cascading waterfalls — he calls them voids — as two empty spaces in the Hudson River west of the smoldering World Trade Center, to mirror the absent towers. The pools moved to the twin towers' footprints, and the Israeli-born architect 's poster board sketch became the centerpiece for the world's most expensive memorial — and a touchstone for post-Sept. 11 battles over how to mourn and how to remember. (AP Photo/Seth Wenig) less 
1 / 1
Associated Press | Photo By Seth Wenig
Thu, Aug 11, 2011 12:52 AM EDT