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Cadillac introduces the Ciel concept, an open-air grand-touring car Thursday, August 18, 2011 in Carmel, California. The Ciel – pronounced “C-L,” the French translation for sky – is a four-seat convertible powered by a twin-turbocharged version of the 3.6-liter Direct Injection V-6 engine, paired with a hybrid system using lithium-ion battery technology. (Cadillac News Photo)