...of a commentary

As time went by, words began to replace objects and gestures in Marco's tales: first exclamations, isolated nouns, dry verbs, then phrases, ramified and leafy discourses, metaphors and tropes. The foreigner had learned to speak the emperor's language or the emperor to understand the language of the foreigner.
But you would have said communication between them was less happy than in the past: to be sure, words were more useful than objects and gestures in listing the most important things of every province and city - monuments, markets, costumes, fauna and flora - and yet when Polo began to talk about how life must be in those places, day after day, evening after evening, words failed him, and little by little, he went back to relying on gestures, grimaces, glances.
So, for each city, after the fundamental information given in precise words, he followed with a mute commentary, holding up his hands, palms out, or backs, or sideways, in straight or oblique movements, spasmodic or slow. A new kind of dialogue was established: the Great Khan's white hands, heavy with rings, answered with stately movements the sinewy, agile hands of the merchant. As an understanding grew between them, their hands began to assume fixed attitudes, each of which corresponded to a shift of mood, in their alternation and repetition. And as the vocabulary of things was renewed with new samples of merchandise, the repertory of mute comment tended to become closed, stable. The pleasure of falling back on it also diminished in both; in their conversations, most of the time, they remained silent and immobile.

[Invisible Cities, Calvino, I.]