This work is a reflection on the poetic theory of the Sensationism of Fernando Pessoa. Its initial presupposition is the author s statement: There is nothing, no reality, but sensation. The textual analysis has shown a decisive procedure, making possible to stress in which way the heteronomity contributed to enlarge the conscience and the poet s perception, offering several possibilities to experience the reality or its sensation as a form of saving the limitations that the individuality imposes. Art in Pessoa represents his untiring search, and scanning all the possible ways, jointed in the fundamental antithesis of knowledge - subjective and objective, spiritual and material, inside and outside, takes on in his poetic speech with and investigative character, the aloofness of conciliating solutions, turning Pessoa himself into the thinking poeting.