The early phase of light control in structured dielectrics and nanoscale resonators reframed how researchers approach photonics, emphasizing engineered band structure and resonant confinement as core design principles. Across the period, plane-wave analyses of periodic dielectrics, high-Q microcavities, and emerging strong light-mmatter coupling established a framework for on-chip light manipulation, guiding the move from bulk optics to nanophotonic devices. The cross-pollination of theory and experiment produced a cohesive research trajectory focused on confinement, guiding, and coupling of photons within artificial media.