The '62 Cougar is not a famous concept car, but I find it interesting. That's partly because it appeared right after American cars had moved out of the rococo era of three-tone paint jobs, swaths of chrome trim, and elaborate tail fins. Yet the Cougar retained touches of fantasies dreamed up the Ford's advanced styling unit back in the 1950s.
This rear view indicating that, aside from the tail light arrangement the design of the car's rear is clean. A production version would have required a higher trunk lid for reasons of practicality, however.