Light cannot pass through most solids due to interactions with the atomic lattice, where photons are absorbed and re-emitted, causing delays in their travel. In contrast, many liquids allow photons to pass because their molecular structure does not impede light in the same way. The energy from absorbed photons is transferred into lattice vibrations, known as phonons, while the photon is effectively "waiting" to be re-emitted. The discussion raises questions about the transparency of liquids to different parts of the light spectrum compared to solids. Overall, the complexities of optical conductivity and atomic interactions play a crucial role in light's behavior in various materials.