This is a library for an art university located in the suburbs of Tokyo. Facing the main entrance gate， the site lies behind a front garden with trees and stretches up a gentle slope. In addition to enriching the library space for the entire campus， from the early stages of planning itwas strongly requested that we create a space capable of enhancing communication between students and professors.
Our first idea was to create a wide open gallery space on the ground level separate from the library that would serve as an active thoroughfare for people crossing the campus on the way to other buildings. This gallery has the same grade as the site and createsthe sensation that the sloping terrain and the front garden’s scenery continue within the building. The space can be used for lectures，performances and as a café for students to get together and relax. Series of continuous concrete arches shroud both floors， crisscrossingeach other as they trace gentle curved lines. To minimize the concrete thick ness of these arches， we adopted a special structural systemin which center steel plates are sandwiched on both sides by a layer of concrete. This construction system allowed the cross joint columnsto connect to ground in an extremely slim shape； the spans of the arches vary from 1.8 to 16 meters， but the thickness is kept to a uniform200mm. By the crossing of these arches， the space is gently divided，yet continuous. Bookshelves and reading tables with undulating forms stretch through the space.