The illustrations show a dense vegetation, which tends towards abstraction and are made from photographs taken in Switzerland, in natural spaces that reminds of primary forests. The production process of the drawings is based on a technique borrowed from the analog photography, using a matrix (here, the negative is replaced by a photocopy of the photographic image in positive), from which the forest representations are revilled by decalking with graphite and carbon pencils, and made possible, thanks to a light source diffused by a luminous table.