2/8/12 Chicago Cadillac's prototype model of the CIEL at the Chicago Auto Show at McCormick Place on Wednesday, Feb. 8th. | Dan Luedert~Sun-Times Media

2/8/12 Chicago Cadillac's prototype model of the CIEL at the Chicago Auto Show at McCormick Place on Wednesday, Feb. 8th. | Dan Luedert~Sun-Times Media

2/8/12 Chicago Cadillac's prototype model of the CIEL at the Chicago Auto Show at McCormick Place on Wednesday, Feb. 8th. | Dan Luedert~Sun-Times Media

2/8/12 Chicago Cadillac's prototype model of the CIEL at the Chicago Auto Show at McCormick Place on Wednesday, Feb. 8th. | Dan Luedert~Sun-Times Media