Carrés d'art IV draws up an inventory of the Squares created by Hermès from 1937 until 2020. For each Square, the reader will find under the photograph of the Square, the name of the model, the name of the designer, the dates of creation and reissue , and a schematic value relating to the rarity and interest of the model. 25 new plates out of texts are added to the inventory. Easier to consult than the previous editions, this book received a warm welcome from the public even before its release, in particular people who could not have had the previous edition which was quickly sold out.