In its constant insinuation that it is governed by obscure formal rules, the book feels reminiscent of writing from the famous French collective the Oulipo, yet it also has the feel of a Christopher Nolan film in its frequent upending of what we understand to be the book's reality, and the slick, sketchy landscape of surfaces in which it takes place. Sentence by sentence, "The No World Concerto" is stylistically unremarkable; the book's innovations, such as they are, occur at the level of large structural features that sit behind the action of this novel.
If I'm reading Porta correctly, the idea behind "The No World Concerto" is to construct a literary text as one might compose a twelve-tone musical composition. Before the innovations of Arnold Schoenberg, composers chose a certain key in which to compose their works (that's why you may see, for instance, "in A Major" in the title of a composition). This method of composition necessarily privileges certain notes and harmonic combinations above others, an artifact that twelve-tone meant to change: instead of granting primacy to notes contained within a certain key, it would force a composer to use all twelve notes of the chromatic scale equally in any given piece – essentially, a composer must cycle through the notes with a systematic regularity.