This thesis analyses the fiction of the Portuguese multiartist Almada Negreiros, marked by a solar perspective, optimistic in his way of reinventing the world and himself in the path of conscious naïveté he sets out on. His work is presented as an existential project in which the various possibilities of the subject in search of personal unity are unveiled: the self meets itself. For the sake of systematization, this study borrows the concept of metamorphoses of the spirit - the camel, the lion and the child phases - from Nietzsche`s Thus spoke Zarathustra, relating them to aspects of the existence of Almada Negreiros as intellectual and modern par excellence. It discusses crucial issues of Portuguese Modernism: tradition and innovation, represented by important participants in the movement. The background is the dissenting space of Orpheu, conciliating opposites. Emphasis is given to the fundamental role of Almada Negreiro`s Nome de guerra, a Bildungsroman that develops the character Antunes and the fictional aspect of the man Almada Negreiros, focusing on self-knowledge.