  The Daya Bay Collaboration has recently reported its first \bar{\nu}_e \to
\bar{\nu}_e oscillation result which points to \theta_{13} \simeq 8.8^\circ \pm
0.8^\circ (best-fit \pm 1\sigma range) or \theta_{13} \neq 0^\circ at the
5.2\sigma level. The fact that this smallest neutrino mixing angle is not
strongly suppressed motivates us to look into the underlying structure of
lepton flavor mixing and CP violation. Two phenomenological strategies are
outlined: (1) the lepton flavor mixing matrix U consists of a constant leading
term U_0 and a small perturbation term \Delta U; and (2) the mixing angles of U
are associated with the lepton mass ratios. Some typical patterns of U_0 are
reexamined by constraining their respective perturbations with current
experimental data. We illustrate a few possible ways to minimally correct U_0
in order to fit the observed values of three mixing angles. We point out that
the structure of U may exhibit an approximate \mu-\tau permutation symmetry in
modulus, and reiterate the geometrical description of CP violation in terms of
the leptonic unitarity triangles. The salient features of nine distinct
parametrizations of U are summarized, and its Wolfenstein-like expansion is
presented by taking U_0 to be the democratic mixing pattern.
