What are the reasons for the emergence of art among primitive people?

Many theories are being built, however, let us understand the most important thing. And what is the main thing in any art, even contemporary? This is an irreplaceable aesthetic human need. Thus, all these primitive for us drawings in caves were for them a guide to the world of fantasy. Many of these drawings were of a ritual nature. Some of those whom primitive people painted on the walls, they worshiped.