Summarize research that develops according Nuccio Ordine 47 sections, throughout 186 pages, is an impossible and futile task. Another approach is possible through selective identification performed in the introduction of the author (XXIII). Indeed, what is it? The "useless" category, which is rarely developed because of its apparent lack of interest. While, as Cyrano said, "this is much more beautiful when this is useless." First question: Can linutile specify the man? The philosopher and biophysicist Lecomte du Nouy answers: "alone in the scale of beings, the man accomplishes unnecessary gestures." When lobserve, the "useless" as a category, is a given of our psyche, From where, the second question: what are people likely to shed light on this part of our being? Psychoanalysts, it goes without saying. Thus Benasayag Miguel and Gérard Schmit, in particular, we suggest that "the usefulness of linutile, this is the usefulness of life, of creation, of love, of desire" because linutile produced what we most useful; this is what creates quon no shortcuts, no save time, beyond the mirage created by the company. Are there third question, part of knowing where the expression of this psyche is concentrated? It néchappe anyone that this is in the literature. Nuccio Ordino gives justification: And who knows if, in the words of Mrs. Erlynne ("In modern life, everything is a matter of margin"), of a famous verse of Voltaire ("the superfluous, very necessary thing"), Oscar Wilde didnt wanted precisely refer to the "superfluous" and linutilité décrivain his own business: that something "extra" that, far from signifying a negative way a "surplus" or "abundance" expresses the contrary which exceeds the necessary This is not necessary, which goes beyond the essential part; and thus corresponding to the idea of a constantly renewed vital flows, and the very notion Quà dinutilité as he washed already suggested a few years earlier in his preface to The Picture of Dorian Gray. All art is quite useless>