One of the most devastating indictments
of the manner in which political "science" courses are taught in
our colleges and universities today is the muck of contradictions
that passes for the notion of a "political spectrum."
A "spectrum," according to
Webster's, is defined as "a continuous range or entire
extent." Observe that this definition does not designate the
identity of the phenomenon, but only the manner in which it makes its
nature manifest: a varying characteristic that forms a sequence of
intermediate values between two opposing extremes.
Without those two opposing extremes the
concept of a "spectrum" collapses into insensibility: one would
never speak, for instance, of a rainbow with two red edges, or of a
thermometer with a boiling point at each end.