The purpose of the study is the public space system in densely clustered sea villages on sloping sites in Japan. The study clarified the special qualities of that specific environment in relation to the exterior public spaces such as the circulation systems and interstitial spaces. The transformations were carried out through rebuilding and construction of annexes. It was possible to establish that the circulation system is independent of the spatial geometrical form. It is possible to state that the there is an autonomy between the space and the function. This phenomenon of spontaneity is rarely found in concepts of the urban planning.
