Bilingual Edition French/English This book is a visual and geographical journey through the artist's work and exhibitions, enriched by five original samples—olive leaves, charcoal, street paper, earth and seaweed—inserted and activated by hand according to the artist's recommendations. In 2024 and 2025, the Espace de l'Art Concret, the Dourven Gallery, the Aline Vidal Gallery, and the Gassendi Museum presented the work of Herman de Vries, reflecting their long-standing relationships with the artist.  Through a selection of exhibition views, documents of in-situ interventions and photographs of the artist in his studios and places of work, this book operates as a succession of visual and geographical wanderings, between exterior and interior, between context and detail, between the world and the work. Five samples (olive leaves, charcoal, paper in the street, earth, seaweed) were taken in the five locations concerned, following the artist's recommendations and included in this publication.