Tiny concept cars at the Frankfurt auto show

The Citroen Revolte features suicide doors and a lounge-style rear seat.

Small is clearly in, as these concepts show. And since concept cars are a bellwether for upcoming automotive trends, expect downsizing to be commonplace among new cars. Most of these concepts are lightweight city cars, easily maneuverable and economical. Mini's entrants add a sporty flavor, while Citroen and Hyundai go for the futuristic. Mazda showed off a stripped-down version of its MX-5, more weekend racer than everyday driver.