[The Opel Genéve Concept made its premiere at the Geneva Motor Show in 1975. It was to be powered by a Wankel engine, but the oil crisis in the early 1970s and the engine’s high fuel consumption halted this project. Photo credit: Opel]

[The seat on Bertone's 1984 Ramarro (a rebodied C4 'Vette) still blow my mind. Photo: Bertone]

[Audi has long been obsessed with aluminum, perhaps never more than with the bare, polished body on the 1991 Avus Quattro concept. Photo: Audi] Read more

[The 2011 Daihatsu FC Sho Case concept is a contender for the boxiest car ever made. It rides on a hydrogen pancake for a platform, hence the wave graphics on the side. Photo: Daihatsu]

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