Ciel means "Sky" in French. This enormous convertible car was intended to explore what might have become a new flagship sedan for GM's top luxury brand. It harkens back to the big Cadillac convertibles of the 1950s, '60s and early '70s. Longer than a Chevrolet Tahoe full-size SUV, the Ciel rides on huge 22-inch wheels. The back doors on this four-door car open rearward.
