Over the course of three decades the Barcelona architecture studio RCR Arquitectes (Rafael Aranda (1961), Carme Pigem Barceló (1962) and Ramón Villata (1960)), winners of the 2017 Pritzker Prize, have developed an architecture that mixes the boundaries of the natural and the artificial. The book was published on the occasion of the homonymous exhibition, held within the framework of the Festival of Architecture and City MEXTRÓPOLI and is based on more than 50 of their drawings in gouache with ink. In this publication an extended selection is shown in three categories: Series, Sketches and Works.