"all literature is displaced myth"

If all literature is displaced myth, is truly everthing in life myth? If you go outside on a nice Bozeman day, and think to yourself, "what a glorious day! the leaves are falling and the sun is out," aren't you referencing literature? Many writers wrote stories, poems, and novels about nature- Walden Pond by Thoreau, for instance- if then ALL literature is displaced myth, most any thought a person has in their brain can be directly linked to literature, and therefore-myth. that's crazy!