In a tender moment at an otherwise raucous Auto Show, General Motors showed what it takes to build a car by asking the design and engineering teams responsible for the 2008 CTS to come up and talk about what they did to improve the sedan. For about 10 minutes, one team leader after another stood on stage, flanked by his or her people, and spoke with pride about the team's role in developing what GM hopes will be a landmark revision. In this cynical world of cars and marketing metal, it was inspiring to see on stage the very reason why we are here and what makes all this madness worthwhile.