It has butterfly doors, a carbon-fiber body and a roof-mounted air intake that spins as the car moves.

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Conceptually similar to GM's AUTOnomy fuel-cell concept of 2002, the i8 like its urban-EV sibling, the i3 is radically different in one respect: BMW says it is actually going to build it, virtually as it appears in concept-car form, complete with its semitransparent body panels, butterfly doors, glowing blue grilles and laser headlights.

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