It has been twenty-one years since the devastating attack on the World Trade Center, Pentagon and a plane that was brought down in Pennsylvania. September 11th, now a day of memorial, marking loss, and remembering heroism in the face of evil. The site that the Towers stood nearly a generation ago now feature two major structures - the Freedom Tower designed to be 1776 feet tall and standing as a defiant response to those who destroyed so much on that day and a pair of pools with cascading waterfalls occupying the original footprints of the towers and, as the name of the memorial expresses, reflecting absence.