‘You cannot begin by calling me France’s most famous living artist!’ Thus Sophie Calle objected to the first line of the obituary I wrote for her, commissioned for the enormous exhibition, À toi de faire, ma mignonne (‘Over to you, sweetie’), that currently occupies the whole Musée National Picasso-Paris. But modesty aside, it is a fact that no other French artist alive today is so celebrated, loved, debated, denounced and, indeed, imitated, around the world as Calle.