XI / XX. At the back edition, signature, year and dedication. Multiple designed for the National Academy of Santa Cecilia. Total edition: 120 copies of which 100 are marked with Arabic numerals and 20 in Roman numerals. Realized by the Il Bulino Art Stamperia, Rome by Sergio Pandolfini. Publication: Resonances # 1 Enrico Castellani and Uto Ughi edited by Marcello Smarelli, Skira editore, Milan, 2006, catalog of the exhibition Resonances # 1 Enrico Castellani and Uto Ughi Rome, Spazio Risonanze, Auditorium Parco della Musica, 2 December 2006 - 12 January 2007.