  Brewster-reflection of a post-paraxial optical beam at a plane dielectric
interface unravels fundamentally significant optical singularity dynamics. We
express the simulated field-component profiles of a Brewster-reflected
post-paraxial beam-field via empirical functions, using which we demonstrate
optical beam-shifts and formation of phase singularities. These occurrences
naturally reveal the presence and complex transitional-dynamics of generic
polarization-singularities -- which we observe via simulation and experiments.
A single reflection being the core process, our method becomes a fundamentally
appealing way to generate optical singularities and to study their dynamics.
