This research aims to examine the work of Amilcar de Castro since his first drawings, under the influence of his old teacher, the painter Guignard, in which we can already see the incision Over matter, the gesture That would define his sculptures, and the choice of drawings as primal force of his structural impulse. Passing through his relation with neoconcretist avantguard, and the ideias of 3D, planar thought and topology, his sculptures are an effort of building constructivist art and thinking in Brazil. Amilcar reaches his singularity through a work of deep existencial character, That even by other means (like drawings and poems) keep it s toughness and existencial impulse. Working with the ideia of constructive language, that sees form as language s appareance and denial of a virtually given space, Amilcar builds a work on basis of something that concerns him over all his life: the conquer of space.