Luxfer Glass Prism Tile Antique Door or Window panel. A beautiful Luxfer tile door reclaimed from a local school. It was indoors so the glass is clear without purple coloration. 312,290 for “an improvement in window-glass” (filed 1882, granted 1885). His improvement was the addition of horizontal prisms to the back side of square glass tiles, which redirected sunlight from windows where it was plentiful, back deep into rooms where light was scarce, reducing the need for artificial lighting and light wells. Luxfer is the best known name in prism glass, now particularly for their association with Frank Lloyd Wright. This item is in the category “Antiques\Architectural & Garden\Stained Glass Windows”. The seller is “stanford316″ and is located in this country: US. This item can be shipped to United States.