1966-1967.27/30. Edition and signature lower in pencil. Silver cardboard disc with 21 holes on cardboard. G. Upiglio printer, Milan; Publisher Edizioni della Quercia. Disc size: 30x30 cm. The work was created for a collective edition to which Lucio Fontana, Heinz Mack, Gunther Uecker and Nanda Vigo each contributed with three works; the edition also contained a poetic text by Nanni Balestrini. Publication: Lucio Fontana. Engravings, graphics, multiples, publications ... edited by H. Ruhè, C. Rigo, Edizioni Reverdito, 2007, p.152 n ° M-4, where an edition of 21 copies + 9 in numbers is indicated. Defects.