It is a book that aims to increase scientific knowledge of the work of Antonio Gaudí through two original contributions: 1) the presentation of the data obtained in the research work in the Colonia Güell Church, the Güell Palace and the House of the boots; and 2) the use of the analysis method based on the theories contained in "Keys to Architectural Construction", by the same authors, which allows the study of the mentioned buildings, to which is added the temple of the Sagrada Familia, from five principles: space, environment, integrity, production and aesthetic convenience. This last aspect, key to the architectural synthesis, is based on the hypothesis of a Gaudinian idea of 'continuity' that would permeate all of his work, coming to shape his radical architectural originality.