  I introduce an entirely new dynamical description for exotic charmoniumlike
hadrons, based upon the competing effects of the strong attraction between
quarks in a diquark, and the inability of the diquark to hadronize on its own
due to being a color nonsinglet. This mechanism naturally explains, for
example, the strong preference of the $Z(4475)$ to decay to $\psi(2S)$ rather
than the $J/\psi$, the existence of a state $X(4630)$ that decays to
$\Lambda_c$ baryon pairs, and why some but not all exotics lie near hadronic
thresholds. Owing to high-energy constituent counting rules, the four-quark
nature of the states produces major changes to both the high-$s$ scaling of
cross sections for producing such states and to the potency of the cusp effect
of attracting resonances to pair-production thresholds. The recently observed
$P_c^+$ pentaquark candidates are seen to fit naturally into this scheme.
