If you have read or watched the Lord of the Rings trilogy, then you are familiar with the Eye of Sauron. It was an eye, rimmed with fire, high on a tower that could see throughout the land.
In many ways, a sunset is like the eye, but it knows it has only moments left to gaze upon the land before it drops below the horizon. Not to worry though, as it returns the following morning to return watch over its kingdom.