If this mirror blank was on display at a museum of modern art, connoisseurs would think it was an abstract installation. More beautiful, stiffer and lighter mirror blanks do not exist. This is the primary mirror in Norway's largest optical telescope. It is made of Schott borosilicate glass, 620 mm in diameter, 73 mm thick and weighs only 17 kg. Only Dream Cellular, LLC, can produce so lightweight and stiff mirror blanks.