The two main objectives of this book are, in the first place, to let everyone know the roots of organic architecture, so much used by Gaudí in his works, and secondly, to encourage readers to go back in time and make an effort to read this great book that nature is, as he told, searching for the existing geometry in animal, mineral and vegetal kingdoms or, in other words, to urge the viewers to look at nature through Gaudí's eyes.In November 1957 Jordi Cussó Anglès entered the model workshop in Sagrada Familia Temple as an apprentice, and ten years later he was made its director. He took part, among other works, in the gathering, study and restoration of the original Gaudí's models destroyed during the first days of Spanish Civil War, in July 1936. Nowadays he lives in Sant Iscle de Vallalta, near Barcelona. In his garden and sorrounded by forests in the Maresme region, the author started his first experiences as an amateur naturalist, searching for the organic forms so masterly reproduced by Gaudí.