If you look at the shot below, you'll see there's a wide black border imprinted on the tailgate glass of the RS. Borders of this type are found on most car glass (excepting primary door glass) across all car brands. They often restrict visibility around A pillars and out the back, and increase the size of the blind spot areas. They also detract from a vehicle's appearance. So why on earth are car makers putting these on their windshields etc.? Anyone ever come across a rational explanation?