In this church, Gaudí, enjoying total freedom in the design, confirmed the validity of the theories that would in the end define his own style. Here, we find construction systems that he later applied to his greatest work, the Sagrada Familia. They include, for example, the inclined columns of the crypt and entry portico. These columns are made of basalt, brought from Castellfollit de la Roca, where they were cut according to the dimensions that Gaudí requested. A founded lead joint was placed between the base, shaft, and capital of these building elements, allowing perfect connections between the pieces, and permitting possible movements of the structure.