MAYA Editions https://www.editions-maia.com/livre/la-clef-des-sols-collectif-sophie-cornu-9782384414239/
At an exhibition on floors, Mathilde, looking for an idea for her creative project, meets a modern artist whose installations amaze her. While she had never paid attention to it, what lay under her feet suddenly seemed fascinating! Armed with this discovery, she decides to set off in search of soils all over the world to study them: she takes along her two best friends and, of course, her notebook, which never leaves her side. But such an undertaking is not easy when you are only twelve years old...