An illumination system for a vehicle includes a truck bed defining a cargo space, a bumper positioned vehicle rearward of the truck bed, and a tailgate defining a recessed surface and rotatable between substantially open and substantially closed positions. A first optically interactive portion is positioned on the truck bed and a second optically interactive portion is positioned on the tailgate. A light source is positioned on the recessed surface of the tailgate. The light source and the first and second optically interactive surfaces are configured to illuminate the cargo space when the tailgate is in the substantially open position and illuminate the bumper when the tailgate is in the substantially closed position.