The territory of Seine Upstream is a  prototypical territory of contemporary urban fragmentation , formed by  specialized enclaves, closed plates and fragments of nature that is changing  radically in its entirety. The  coming years may be an opportunity to reopen the discussion on the current  characteristics of the territory in addressing environmental issues as a  catalyst that produces innovation project of the city and the country, which  produces new relationships between natural ecologies and artificial .The challenge is to make it habitable  territory today very specialized and hard in several of its parts. 
            To  make it more habitable territory, the proposed overall strategy involves the  reconstruction of ecological and functional connections between the plateaus,  hills and valleys, which requires work on both the biological, ecological and  programmatic aspects in the broad sense . Elements  that could be carriers and carriers of a porous city project are numerous: they  act at different scales and with specific terms. 
              The  study proposes to reflect on all the possibilities of expansion of existing  naturalness , the naturalness of infiltration along preferred directions, its  percolation through more or less permeable materials according to their density  and. These  arrangements movement can also guide us in the programmatic reflection must  know and understand leverage existing practices, identify and take into account  , as well as devise new . 
                Developed  strategic projects take place in three sequences. Indeed,  between the Seine and Seals we recognize three main sequences project, each  defined by a theme and a specific territorial condition. 
                  The  three sequences are connected by efficient TC and appropriate spaces waves  infrastructure environment. Strategic  projects and new rules of territorial construction will define a new space and  permeable structure , but also the percolation processing in tissues, activity  areas along the infrastructure beams. 
          The  three sequences suggest three themes in urban and metropolitan scale : Sceaux  sources Ru Rungis , the first and the Plateau with the new urban park (the  " Boomerang " and " Lambda ") the second ; arrival the Seine and through the  third . Together,  they define a new territorial public space, support the transformation.  |