Publication containing black-and-white reproductions of the letters and other such forms of mail art sent by Plinio Mesciulam to twelve fellow members of the art scene in Geneva. Participating artists include Armando Battelli, Germano Beringheli, Germano Celant, Viana De Rosa, Ida Gianelli, Caterina Gualco, Corrado Maltese, Gualtiero Micheletto, Edoardo Manzoni, Paolo Minetti, Rinaldo Rotta, and Geggi Tagliafico. In Italian.