The structure takes the basic form of a large spiral, a very dramatic form which nonetheless arises out of the nature of the material and appears very logical and natural in its place. Partially included secondary materials are introduced to help define the building's function. The idea was to create a link between open and closed spaces through the continuity of the sheets of steel. What are walls inside become ceilings and floors on the outside, creating a series of fluid changes without distinguishing them as elements.
This new heterogeneous form challenges the norms of the modern architecture which the visitor is used to seeing in existing constructions.
The functional programme requires an economical "open" scheme yet a formal appearance of a "closed" environment to give the user a sense of security.
The characteristics of the "open" are essentially the possibility of free passage which the architect supplies in three directions, without identifying a specific entrance point. Shelter (the sense of being closed in) is provided by the sheets of steel enveloping the visitor and accompanying the visitor from the outdoors in.
This duality is a part of the style which architect Shuhei Endo defines as "halftecture", which introduces outdoor space into the architectonic construction.
The project has earned considerable recognition: it won the ar+d "World's Leading Emerging Architecture" price in 2000, awarded by "The Architectural Review" magazine, and was one of ten finalists for the Borromini award for young architects in 2001.