I describe library as a place where one can detach from everyday life and attach to things that happened hundreds of years ago, happen in the fantasy world, happen in the spiritual space. With this description I regard library as a spiritual space rather than a functional building. It also influences all the decisions though out the design, site selection, space formation and material choosing. All these things put together to sculpture a place which is detach from everyday life. The site that I choose is under skanstullsbron which has a mega structure however surrounded by water and woods. The strong contrast between human scale and huge structure is the drama part of the design. A small out door space is design in the viaduct structure which is the closest to the top of the viaduct carry up this contrast to max. The original structure is beautiful therefore I design to create a place that people can stay and expose the original structure as much as possible. In this case, in the arch part I do not place any wall, just insert two bridges and platform to make it accessible.