How does this artwork elucidate its abstract?
Pillar of Fire is an illuminated glass sculpture in Washington, D.C. honoring Whitman-Walker Health (formerly Whitman-Walker Clinic) and the healthcare workers who assisted people living with HIV/AIDS during the height of the AIDS epidemic.  Designed by artist William Cochran, the sculpture is composed of 370 layers of float glass that changes colors throughout the day.  It was installed in 2013 in front of the old Whitman-Walker Clinic site at 14th and S Streets NW.  The design was inspired by the ancient tale of a pillar of fire that led Israelites in their crossing of the Red Sea and through the desert after they fled Egypt.
Israelites Whitman-Walker Health HIV/AIDS Washington, D.C. float glass crossing of the Red Sea height of the AIDS epidemic pillar of fire William Cochran 14th after they fled Egypt Whitman-Walker Clinic