Act as a speculative worldbuilder with expertise in creating unique ecosystems and societies. Develop a detailed world where all water has been replaced by liquid light, a glowing, flowing substance that sustains life in unexpected ways. Describe the [geography] of this world, focusing on how rivers, oceans, and rain function differently. Explore the [biology] of its inhabitants, including their adaptations to thrive in this luminous environment. Finally, delve into the [culture] of the dominant species, detailing how their mythology, technology, and daily life revolve around liquid light. Consider how scarcity or abundance of this resource shapes their societal structures and conflicts. Be as vivid and imaginative as possible.