This building was erected along the Suwa lake of Nagano as the town museum. The function of the museum is to introduce the history and nature of Suwa lake and there are two permanent show room for introducing life of poet—Akahiko Shimagi. In addition， there are speech halls for collection， special show， experiential learning.
The building is divided into the linear part on the side of the lake and the cube construction part on one side of the mountain. The latter has a library and special exhibition hall. Between two parts of building a water body with the function of well was set up.
The front building in shape of small boat is a three dimensional surface space formed by one half steel arch shell continuously structured inside the bent concrete walls. The epidermis is made of aluminum alloy panels and inside skin is made of small board.
When people go to the second floor by the elevator extending from the well， they will be on the glass floor. Looking towards the exhibition hall， they will see the exhibition hall which introduces the history and geography of lake as well as fishing method. Water from front lake and lower overlap each other， which makes people feel as if they were in the lake.