On the $pi$ and $K$ as $q bar q$ Bound States and Approximate Nambu-Goldstone Bosons

We reconsider the two different facets of $pi$ and $K$ mesons as $q bar q$ bound states and approximate Nambu-Goldstone bosons. We address several topics, including masses, mass splittings between $pi$ and $rho$ and between $K$ and $K^*$, meson wavefunctions, charge radii, and the $K-pi$ wavefunction overlap.