Honoring lives lost on 9/11 today. The World Trade Center Memorial, designed by Michael Arad, opened two years ago, on the 10th Anniversary of 9/11. This new memorial honors victims of September 11th and the victims of the earlier terrorist attach -- the 1993 bombing of the North Tower. It is called "Reflecting Absence." The Twin Towers of the World Trade Center, once the tallest buildings in the world, were designed by the American architect Minoru Yamasaki in 1965 and completed in 1973. They were minimalist structures of glass and steel that symbolized a modernist corporate image. They were often derided as lacking in character but over the past decade, the Twin Towers have become icons of lost dreams. Paul Goldberger calls them Martyrs, and Martyrs are beyond criticism. The World Trade Center Memorial demonstrates the power of simplicity to evoke what we experienced ten years ago. Finally, there is a home for the ceremonies at Ground Zero, a home reflecting absence, a home conceived by design.