This image provided by the Dallas Museum of Art shows Planispheric Astrolabe from Spain made from cast and engraved brass. It is among 150 rare Islamic works of art and scientific objects that explore the use and meaning of light on exhibit at the Dallas Museum of Art. "Nur: Light in Art and Science from the Islamic World" opened over the weekend. Nur is the Arabic word for light. (AP Photo/Dallas Museum of Art)
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