A border evident, city's Frontier within a city, which extends up to the sea, a visual barrier that stimulates the imagination. A boundary between two cities that works according to the location of the observer. I wanted to evoke its presence with an armored glass used as a filter, the glass becomes shrine in which preserve the memory, as a defense against external agents, but that returns an influence on neutrality, coloring the vision. The same dominance is in reproduction in glass of sections of the border, which place as the link between the land's history , view from the Napoleonic cartographer Pierre-Antoine Clerc, and the contemporary form of the naval army arsenal in La Spezia (Italy), building a bridge between the two cities.