We have regarded the development of the child's individuality or individual expression as important for a long time in art education. But we tend to forget contradiction the art teachers require each child to express his/herself 'freely' in the 'restriction'. In this article, I explore the restriction that agrees with the child's will to express because children cannot develop their life force by mere 'given' restriction. One important viewpoint is the motive of the child's expression. W.Grozinger and R.Steiner said that the child's (especially the infant's) expression appears from inside their body. So they began the education of form drawing on some restriction based on physical sense. In physical sense, there is our inside nature, namely the history of man. We can find a source of restriction in physical sense and experiences through it. They make the motive of the child's expression natural.