Written by four hands, the current volume moves on two planes that fruitfully intersect and sometimes conflict in their interpretations. On the one hand, Petar Bojanic proposes that gestures are not parasitic of social acts but instead constitute a supporting element. From this interpretative angle, gestures contribute to the constitution of a group or institution. On the other hand, Virgilio Cesarone first presents a phenomenology of gesture, showing that non-instrumental gestural expression, which refers to the constitution of another's body as alter ego, is truly human. Furthermore, gesture shows its essentiality precisely at the moment when it serves no purpose. He thus proposes a hermeneutics of gesture, aiming to show that gesture cannot be considered an accessory and expressive element of a thought that is inwardly closed, but part of a thought that moves with the hand itself.