The labradorite beads speak to the firefighters' own descriptions of  the smoke and dust that enveloped them ... and finally the small flash of light that led them to safety.   The lattice design of the cross is reminiscent of the skeleton of the stairwell, revealed when the rubble was removed.  The Holy Spirit centerpiece honors God's grace, which blessed these seven survivors in a tangible way on September 11, and brings to mind the dove of peace.