F.T. Marinetti, Parole in libertà: olfattive, tattili, termiche (Words-in-freedom: olfactory, tactile, thermal), 1932.
Cover by the author.

Just five years after Depero's sensational "mechanical" book that featured a two bolt binding, Marinetti introduced his definitive model of the mechanical book. While Depero's was printed on conventional material (paper), Marinetti's new book was entirely printed on metal sheets. In this way, the book came even closer to the signs of the Machine Age, and aimed to be an imperishable book. The book's content was no less interesting, as Marinetti introduced new references between words and physical interaction with olfactory, tactile, and thermal sensations.