Cadernos Ultramares seeks to present Brazilian culture and thought in a qualified way, through volumes bringing together important essays by renowned authors in different areas of knowledge. Hélio Oiticica was one of the most powerful thinkers on contemporary art in Brazil. In the essays collected in this volume, Oiticica proposes and performs, as Mário Pedrosa has said, an "experimental exercise of freedom" by presenting his most important creations, such as the Bólides, the Parangolés, and the Penetráveis, which allowed the artist to think in a seminal way about environmental art.