How did light come into being?

In the story, Polina, a young girl, wakes up to a sunny day and begins to wonder about the nature of light. She discusses this with her grandfather, who explains the significance of light in a poetic and educational manner. He describes light as a fast, bright force that brightens the world, creates rainbows, and is essential for life on Earth. The story conveys a sense of wonder and appreciation for the natural phenomenon of light.