Grand Central Station Clock Tower, the 13-foot clock in front of the façade facing 42nd Street contains the world's largest example of Tiffany glass.
It is surrounded by sculptures Minerva, Hercules, and Mercury. The sculptures were designed by French sculptor Jules-Felix Coutan and carved by the John Donnelly Company. At its unveiling in 1914, the 48-foot high trio was considered the largest sculptural group in the world.
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Blue Sky and Clouds were added on another layers were used to enhance the image.
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