Cartobulle-1 was the first event (salon) for postcards (Carto) and comics (Bulle) organized in Chartres by a group which called themselves Cartobulle 28. Auclair was honorary member, and made this illustration of Celtic riders and the cathedral of Chartres near the horizon. A friend of Auclair, and owner of a bookstore, took care of a limited and numbered reprint, which the organizers consider to be a pirate-version.