Car design changes are undeniably a key part of this era! Over time, from the mid-fifties to the late sixties, the design of American cars changed. In general, if one were to describe the visual appearance of cars of that time in an unbiased way, one could say that they began to look more and more like a “four wheel box” of sorts. The glamour of the ’50s began to recede more and more into the past. Functionality and power were preferred.