They change color according to the interior temperature set by the occupants.

ENGADGET: Mercedes-Benz GLA concept puts laser projectors in headlights, redefines SUV

The open workspace design of the building brings exterior views to 90 percent of employee work spaces, and the coated windows help regulate the interior temperature without boosting energy costs.

FORBES: NASCAR's headquarters earns LEED Gold certification

If a cooler temperature is selected for the interior, they turn blue, while choosing heated air switches the illumination to red.

ENGADGET: Mercedes-Benz GLA concept puts laser projectors in headlights, redefines SUV