This thesis takes the approach of an hermeneutic analysis of the techniques and the aesthetic experience of performance art since the origin of western technoscientific culture, because we want to find the answers which guide us towards understanding “what is performance art?” “what is its meaning?” and “why does it arise in the postmodernist time of contemporary art?” And so, finally, we want to acheive the code of the logic meaning which moves the many and various forms of the performance art´s syntax. If, since the presence of body and of human action new creation techniques and new media for sculpture production in perspective of real time daily reality are established; if, the performer uses and handles -with the sensibility and intuition of his know-how of usable techniques- concepts that are creative tools; if in the aestetic game of collage of his actions he produces an open syntax, indeterministic and diffuse, provoking multiple meanings in the viewer’s imagination; the fuzzy logic appears to be a structure of the formalization of contemporary correlative thinking and useful to understand, describe and propose creative space for performance art, procuring in a better way than the rationalistic method. Indeed, the system of the fuzzy logic allows to analyze, identify and integrate into its formal structure, among other things, the complexity of the creative process which develops from subjectivity, sensibility and intuition the momentum of performance art. Synthesis in which, in that sense, it is finally validated that the know-how techniques for performance art are part of the science; and it describes an essential part of the nature of art which is related to the intuitive, sensible and poetic perception of the potential of the artist´s genius.