Designer Alex Tremulis counts among his many creations the Tucker 48, as well as the flying saucer (really -- he drew flying saucers and aliens during WWII, for the government). His stylings tended to straddle the fine line between genius and insane, and perhaps no car does that better than the X-2000.
It was supposed to show what cars would look like in the year 2000. It um… failed. Sixty years later, though, it’s one of just a handful of truly iconic concepts that represent the extremes of the jet-era car designs.