In 1983 the Nissan Motor Company celebrated its 50th anniversary and they showed in Japan a commercial that revealed a space age looking concept car that got updated to the 80s taste:
Sleek looking aerodynamic (not soap bar yet) delta wing idea that must have convinced people in the 80s that Nissan was seriously going to make flying or rocket cars in the (near) future. This Nissan concept car certainly does that!
If you squint your eyes you can make out the 1971 Nissan 216X concept car:
Interestingly enough there is also another concept car called the NX-21 that introduced the EXA concept:
Yes, this Nissan concept car is somewhere between the 216X and the EXA but nowhere near the one shown in the commercial. ;)
For completeness here is the 80s Nissan commercial:
Direct link to video: 1983 NISSAN 50th-1 Ad
Concept car photos via: Carstyling.ru and Conceptnissan.com
I think mitsubishi mightve stolen some design ideas from this for the SVX.
http://images.drive.com.au/drive_images/Editorial/2008/04/14/14svx_m_m.jpg