“Gradation in the Forest“ is a house in a forest of a summer resort. The house stands calmly in the forest and is made of a collection of small spaces. Various spaces were prepared, in order to make a rich living environment. A gradual change of the quality of spaces was made, like the picture "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 are smoothly sewn on, so that the boundaries may be blotted out.