In fact, the people he portrays are "Look-alikes". So are we looking at the original or a double? Who is Who puts a finger on a sensitive issue in the media and its obsession with stars, where authenticity and identity often ring hollow. Spoerri wants to spark a discussion about the power of the mass media. Altogether, 80 people appear in his new book published by German editor Verlag für moderne Kunst Nürnberg.