Long bonnet, long wheelbase, short overhangs - the BMW Z4 Roadster has classic roadster proportions, but combines them with a style that's all its own. The concave and convex lines create an intriguing interplay of light and shade, the striking nose bears a prominent double-kidney grille and the rear has an unmistakably sporty look. It all adds up to a roadster that's as thrilling to look at as it is to drive.