A practical French-language craft manual on cartonnage, the technique of covering and shaping cardboard into decorative objects. The work focuses on the methods and construction skills needed to produce finished cartonnage items, emphasizing preparation, cutting, covering, assembly, and finishing. It is intended for readers who want a hands-on guide to the craft, whether for personal projects or for developing more precise workshop techniques. The title indicates a technical approach rather than a general history of the craft, so the book is best understood as an instructional resource for learning the structure and execution of cartonnage projects. It should be useful to crafters interested in paper-based decorative arts, handmade boxes, covered boards, and related cardboard constructions.