Car companies are coming up with a lot of radical ideas. Here are ten that should go the distance, from Detroit's 2007 North American International Auto Show.
Mazda Ryuga
The Mazda Ryuga's windswept shape was inspired by nature--and aerodynamics
Most intriguing concept:
Mazda Ryuga
The undulating car (Ryuga is Japanese for "gracious flow"), with enormous double gullwing doors, signals a radically new direction for Mazda--one that may help convince the world it is serious about its focus on speed and performance.

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Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer. Morningstar: © 2018 Morningstar, Inc. All Rights Reserved. Factset: FactSet Research Systems Inc. 2018. All rights reserved. Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor's Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2018 and/or its affiliates.