Is this natural or artificial? Ever asked if a part of the rainbow is black or white? Ultimately, let's not forget the name of the game: survival of the fittes

Is this natural or artificial? Ever asked if a part of the rainbow is black or white? Ultimately, let's not forget the name of the game: survival of the fittest. Unless free-will allows the choice to play another game ;) Edit: apologies for my first downvoted comment, never meant to bring negative value to the discussion, especially on a topic that I'm glad to see here. Any improvement tips to share? :)