Within the existing Roman structure (from which the geometric-spatial order, urban definition and direction was taken), the archeological grid becomes the basis for the functional scheme of the library, and the excavations the foundation of the future architectural composition. Three basic volumes of the library, set on an elevated plateau, hover above the existing excavations. The uniformity of the forms themselves requires the unity of space, function and organization. The square, which is in itself a necessary foyer of the library, is located below the building itself along the ancient F and H streets. The original walls of the archeological site determine the depression of the square and its connection with the city streets Ziosova and Emonska (the main entrance to the building). The planned passage through the building becomes an active beach, accessible from all sides. Together with the existing residential building, the library forms a block in the northwestern part of the plot. At the junctions of the old and the new, the new volume descends, respecting the existing structure. The compact volumes (four storeys high) arise from a two-storey base located above the free ground floor and mezzanine. The Library building is mostly an introverted mass. Historic Roman excavations are partially enclosed in glass insulae on the first two floors. Above them hovers a heavy body, whose skin is made of stainless steel, which distortedly reflects its own environment. The massive volume is cut with glass surfaces with a visible interior. The interior itself becomes the light of the building, a kind of sequence of internal movement of users, colors, furniture. The building is planned as a low-energy design.