In this episode of Lights, Cities and Architecture, we explore the fundamental role of light in shaping how we experience the world around us. From the science of what light is, to its impact on human perception, health, and circadian rhythms, the conversation moves between technical insight and philosophical reflection.We discuss how artificial lighting has transformed modern cities into 24-hour environments, often at the cost of our connection to the natural night sky. The episode also highlights the importance of darkness — not only for human well-being, but for ecosystems, cultural practices, and our sense of place in the universe.Drawing from architecture, urban design, and art, including the work of James Turrell and the Light and Space movement, this episode invites listeners to reconsider light not just as a tool, but as a powerful medium that shapes experience, emotion, and meaning.