The interior is configured by a main T-shape expansion of two movements that organise the plan of the different living spaces of the apartment. This is a recognizable, peculiar boundary: it is closed and transparent at the same time. The spaces communicate visually with the existing “container” since the new constructed boundary is not merely a dividing panel but it is configured by linear elements (column) and surface ones (plate, wall). The system of vertical axes emerges as the main synthetic element through its structure, emphasizing its juxtaposition to the existing boundary, which remains a neutral receptor.