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.