Olga Cafiero’s photographs, taken especially for the book Lignes de crêtes: Promenades littéraires en montagne (Ridge Lines: Literary Walks in the Mountains), accompany the twenty literary walks featured in the book. By playing with color filters, the artist highlights the different visible and invisible layers of the mountains, revealing often hidden aspects of the alpine landscape. These images capture the diversity and beauty of Swiss landscapes, from the Jura to Graubünden, via Valais and the Vaud Alps. They illustrate the grandeur and fragility of the mountains, echoing the literary texts. Each photograph enriches the reading experience by offering a unique and nuanced view of the landscapes described, making Lignes de crêtes an invitation to discovery. Published in 2021 by Éditions Noir sur Blanc, Lignes de crêtes is a collective work combining literature, geography, and photography around twenty hikes across Switzerland. The authors of the book are Florence Gaillard, Daniel Maggetti, Stéphane Pétermann, Jonathan Bussard, and Emmanuel Reynard.