Freely inspired by the work Catatau, by Paulo Leminski, the plot begins with the historical hypothesis imagined by the poet from Curitiba: “What if René Descartes had come to Brazil with Maurício de Nassau?” The film materializes this hypothesis and joins the father of modern philosophy in his journey through the tropics. Under the effect of hallucinatory herbs, he investigates questions revolving around geometry and optics in the face of an absolutely strange world. Known for his famous sentence “I think, therefore I am”, Descartes faces his doubt towards phenomena reason doesn’t explain. René, Renatus, Re born.