  The Dirac structure of confinement is shown to be of timelike-vector nature
in the heavy quark limit of QCD. This stands in contradiction with the
phenomenological success of the Dirac scalar confining potential. A resolution
is achieved through the demonstration that an effective scalar interaction is
dynamically generated by nonperturbative mixing between ordinary and hybrid $Q
\bar Q$ states. The resolution depends crucially on the collective nature of
the gluonic degrees of freedom. This implies that dynamical gluonic effects are
vital when attempting to incorporate fine structure in models of the $Q \bar Q$
interaction.
