Segno e parola is the title of the exhibition organized by the Istituto per il Lessico Intellettuale Europeo e Storia delle Idee (ILIESI) of the Consiglio Nazionale delle Ricerche, to celebrate its 50 years of research activities. The event has been organized in collaboration with the Istituto Centrale per la Grafica in Rome and it is dedicated to the works of Carlo Lorenzetti, sculptor and engraver. Since the mid-eighties, the art of Carlo Lorenzetti has been associated with the most relevant initiatives of the Institute, in particular the International Colloquia that ILIESI organizes every three years since 1974. The colloquia focus on a philosophical concept, encouraging the comparison among different methodologies and strategies to approach texts. To bring together in a public exhibition the results of a so intense and lasting cultural association seemed the best way to celebrate fifty years of the Institute's activities. In this exhibition, hosted in the beautiful rooms of Palazzo Poli from 16 April to 21 June 2015, the artist has presented the original designs of posters prepared between 1986 and 2013, accompanied by preliminary sketches and two unpublished works. The catalog, edited by Giovanni Adamo and Cristina Marras, collects posters, drawings, sketches and sculptures on display, accompanied by critical considerations and essays by Tullio Gregory, Antonio Lamarra and Maria Antonella Fusco, Eugenio Canone and Antonella Renzitti. In addition to the works of the Master, through the exhibition visitors had access to documents, databases and digital archives of ILIESI. As a matter of fact, "Segno" as a vehicle of history of the European-Mediterranean culture and "Parola" as a crossroads of cultures and languages, were the focus of the exhibition. "Segno e parola", was an opportunity to reflect on the history of ideas that have crossed throughout the twentieth century and has proposed an uninterrupted synthetic expression of the dialogue between art, philosophy and culture, between graphic and linguistic signs.