Field of Empty Chairs - Each of the 168 chairs symbolize a life lost, with smaller chairs representing the 19 children killed. Arranged in nine rows, one for each of the nine floors of the building, they are placed according to the floor on which those killed were working or visiting. Each bronze and stone chair rests on a glass base etched with the name of a victim. By day, the dhairs seem to float above their translucent bases. By night, the glass bases illuminate as beacons of hope.