The book is divided into two roughly equal halves; the first, Simultaneita, contains 12 'simultaneous' poems laid out in standard typography; the second section, Chimismi Lirici, contains 10 poems that use multiple fonts, signs, adverts, brand names, repetition and onomatopoeiac devices that are contemporaneous to Marinetti's similar experiments in Zang Tumb Tumb, and prefigure Marinetti's later, more abstract Les Mots En Liberte Futuristes, 1919.
His book, Relativity, Time and Reality, is a controversial critique of Albert Einstein's concepts of time and simultaneity in Special Relativity.
This led to Simultaneity recordings that were not made in the same location: in December 2004, with volunteers primarily from CEC Canada’s online forum, a recording was made simultaneously in countries around the world: volunteers were asked to record exactly the same twenty minutes of their environment wherever they were in the world, regardless of time-zone, but to include something that marked the hour changing.