  For two flavors, the seesaw matrix can be identified with a two dimensional
representation of the Lorentz group. This analogy facilitates the computation
of physical neutrino parameters, while giving an intuitive understanding of the
results. It is found that the induced mixing angle exhibits resonance behavior.
For maximal mixing, we derive a precise relation among the right-handed mixing
angle, the Majorana mass ratio, and their phase.
