The superior quality of the materials and their unions played an important role in the process of the creation and realisation of the project. Bioconstruction criteria gave preference to natural materials, and where possible, local materials: sculpted rock, crushed gravel from the excavation, capri limestone, pine and fir wood, recycled cotton panels, white macael marble, high permeability silicate painture, and more. All this is reverted to hygroscopic enclosures which are permeable to water vapour and guarantee a pleasant and healthy indoor environment, while at the same time requiring less energy for the proper functioning of the building.