  We present a new dynamical picture that identifies the formation of the
exotic $\bar c c$-containing states $XY \! Z$ with the confinement-induced
hadronization of a rapidly separating pair of a compact diquark and
antidiquark. This picture combines the advantages of diquark-based models,
which can accommodate much of the known $XY \! Z$ spectrum, with the
experimental fact that such states are both relatively narrow and are produced
promptly. It also naturally explains the preference of some of the exotic
states to decay to $\psi(2S)$, rather than $J/\psi$, in terms of a simple
wave-function overlap effect.
