What is art for human being? Why does human being express? Art is the occurrence that emerges from the fundamental life, more concretely, the re-creation and the re-presentation. This treatise is going to investigate the essence of art from the standpoint of the creator, especially by focusing on the problem of body at the scene of artistic production, and in addition by extracting the interaction of watching while producing there. This art theory puts the essence of art on the expression of life.