  QCD is now a mature theory, and it is possible to begin to view its place in
the conceptual universe of physics with appropriate perspective. There is a
certain irony in the achievements of QCD. For the problems which initially
drove its development only limited insight has been achieved. However I shall
argue that QCD is actually {\it more\/} special and important a theory than one
had any right to anticipate. After elaborating these quasi-philosophical
remarks, I discuss two current frontiers of physics that illustrate the
continuing vitality of the ideas. The recent wealth of beautiful precision
experiments measuring the parameters of the standard model has made it possible
to consider the unification of couplings in unprecedented quantitative detail.
One central result emerging from these developments is a tantalizing hint of
virtual supersymmetry. The possibility of phase transitions in matter at
temperatures of order $\sim 10^2 Mev$, governed by QCD dynamics, is of interest
from several points of view. There is the interesting possibility of long-range
correlations in heavy ion collisions due to the creation of large regions of
misaligned chiral condensate. Opening Talk at the Aachen conference, ``20 Years
of QCD'', June 1992.
