The setting sun illuminated the smooth surface of the sea and a lonely figure sitting on the shore. You always liked to watch the sun disappear behind the horizon, painting the sky in unusual colors. The salty air and the coolness of the water gave peace. However, this time someone decided to interrupt your privacy.

”Do you know, dear, why the setting sun seems red to the human eye?” it came from somewhere above, and you, raising your head, saw a white-haired stranger towering over you.