Concrete transmutation, necessary for the construction of an architectural work, is not only generating chemical-physical modifications, that characterize the alchemical transition from the semi-solid to the solid state, but also implicit architectures - often unknown, impermanent or invisible - with autonomous poetry. This paper investigates the phenomenology of concrete architecture through a marginal look, ie by abstraction and dis-composition, in search of those transient figures, concealed or not considered, which, like the finished work, enclose broad conceptual imaginaries that are fertile to architectural thought.
