Photos: The one-of-a-kind Efijy concept car

The Detroit Auto Show shifts gears this weekend when it opens up to the public after a hype-heavy series of product unveilings earlier in the week. Amid all the production models (the 2008 Ford Focus, Hyundai Veracruz and Porsche Cayenne Turbo) and the concept cars (the Chevy Volt, Nissan Bevel and Mercedes-Benz Ocean Drive), one highly retro ride should stand out: the "soprano purple" Holden Efijy. No, it's not an extra from the Pixar flick Cars.

Photo by GM Holden