The subject of this book is not the void exactly, but rather what there is round about or inside it. To start with, then, there isn’t very much: nothingness, the impalpable, the virtually immaterial; extension, the external, what is external to us, what we move about in the midst of, our ambient milieu, the space around us.

Space. Not so much those infinite spaces, whose mutism is so prolonged that it ends by triggering something akin to fear, nor the already almost domesticated interplanetary, intersidereal or intergalactic spaces, but spaces that are much closer at hand, in principle anyway: towns, for example, or the countryside, or the corridors of the Paris Metro, or a public park.