  In the wake of the SuperKamiokande announcement of atmospheric neutrino
oscillations which favor the large mixing of $\nu_\mu$ with $\nu_\tau$, there
is considerable theoretical activity towards a possible understanding of the
solar neutrino deficit also in terms of the mixing of $\nu_e$ with the other
two neutrinos. A specific dynamical model is presented here for the first time
which naturally chooses the large (small) mixing solution to atmospheric
(solar) neutrino oscillations.
