Since the early 1970, Sophie Calle has created a number of exhibitions around the world. She has been described as a conceptual artist, photographer, video-artist and even detective and has developed her own distinct modus operandi, combining text and photography to tell of something deeply personal. She is considered one of the greatest artists of the 21st century. The archaeologist and prehistorian, Jean-Paul Demoule is an emeritus professor in European protohistory at Paris I University (Panthon-Sorbonne) and an honorary member of the Institut Universitaire de France. He specializes in this history of archaeology, its ideological constructions and its social role.