Richter devised a mathematical formula to systematically mix permutations of the three primary colours and gray. The Cologne window is made of four-inch "Pixels" cut from original antique glass in a total of 72 colours.
Art Installation Featuring Twenty Miles of Ribbons Suspended in San Francisco's Grace Cathedral
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Check out the Beautiful "stained glass" water tower sculpture by Brooklyn artist Tom Fruin. It's in the DUMBO section of Brooklyn (the Down Under the Manhattan Bridge Overpass area.) It's made of plexiglass and steel.