Sky is miscellaneous: yellow, blu, red
It is believed: "There are three things you can watch forever: fire, water, and other people working"
It appears, that for each person there are unique objects of "infinite" attention. They are formed in direct relation to the person's state of mind.
Making of the photo records of celestial behavior emerged from the desire of people to share the beauty, for the sake of which we so rarely raise our heads.