“Gradation in the Forest“ is a house in a forest of a summer resort. The houses stand calmly in the forest. This house is made as a collection of small spaces. Various spaces were prepared in order to make living environment rich. A gradual change of the quality of spaces was made, like the picture of "Metamorphosis" of M.C. Escher. In this house, the spaces with various characteristics exist as the process of ambiguous boundaries and continuous changes. Many spaces have kept the variegated characteristics of each space. And, many spaces smoothly sewn on so that the boundaries may be blot out.