There have been key moments when forms and modes of perception and expression shift in a profound manner. Such shifts may be met with skepticism, even hostility. Eventually, a new paradigm seems to emerge, although the malleable nature of art is such that the new paradigm can co-exist with its forerunners – yet not always peacefully so. The predictable and easily danceable swing tunes of Benny Goodman-era jazz developed into the more amorphous, multi-dimensional bebop. The realism of 18th century paintings gave way to the new imageries of “modernism” and later to “postmodernism” (a term simultaneously impossible to prescriptively define and curiously passé).