A well-known aphorism of the philosopher Rudolf Steiner, father of Steiner-Waldorf pedagogy, states that «teaching is not only a distantflow of information, but a warm relationship between two human beings, in which one is thirsty for knowledge and the other one is devoted to transmitting all his human and intellectualexperience». The expression «heating with its fire the deaf matter» is an ideal starting point to reflect on the book edited by Emilio Faroldi and Maria Pilar Vettori: not a tedious anthology, but a collection of authorial essays by "magisters" of architecture. The volume includes the contribution of fifteen authors, who have been able to leave "signs" to those who approach the art of Vitruvius. The articulated and rich reflection is presented in three different languages - Italian, English, Spanish - refl ecting the cognitive process that leads the transmission of knowledge: hybridized and contaminated, revealing cultural assonances and divergences among the authors.