Molten glass is turned into insulation at the Johns-Manville Corporation in Berlin, New Jersey the orange-hot fluid is forced through holes in a palladium sheet to form long, thin fibers.
The bathroom door had a glass window covered with a portrait of a woman in pre-Raphaelite style on a thinsheet that made it look like stained glass from a distance.
And the Corning Web site seems to confirm that this is special stuff: "Gorilla glass is an environmentally friendly alkali-aluminosilicate thin-sheetglass."