Abstract
To clarify the meaning of children's artistic expression, I assumed that artistic expression is media. I attempted to explain children's artistic expression with Marshall McLuhan's Media Tetrads. The theme "Mysterious world in the box" was practiced by the fifth grade pupils and I investigated their expressions with the question paper. This article is based on the hypothesis of Marshall McLuhan's "Laws of Media". Artistic expression as media extend the child's desire and wish, recover a physical sense, and gain the sense of relief. But the excess of extension obscures the boundary of the reality and the imagination, declines immediate participation in things, realism, and the desires of reproduction.
