Urban morphology and architectural design of city edges and vertical connections in historical contexts

The papers considers, with a comparative approach, the architecture of vertical connections and city edges. We hypothesize that the city edge, when its elevation overwhelms the surrounding urban fabric, cannot be redesigned within a basic typological repertoire. This research considers the transformations of the edge in historical towns, taking into consideration the architectural models used and investigating the contextual deformations impressed. The design of vertical connections between different city levels redefines the image of the city from its meaningful points of view, changing the collectively recognized city image. A repertoire of models, divided into typologies according to the morphology of the site, is the base for a new theory outlining which parameters (i.e. measure, elevation, slope, and major urban nodes) to use to deform models in each context. The study cases range throughout the history of architecture, focusing on some pre-modern examples such as Laurana's Torricini façade in the Palazzo Ducale of Urbino.