Barba non facit philosophum. L'habit ne fait pas le moine. In those proverbs, Latin and French, we find the classical opposition between appearance and reality—between the accessory (the superficial, the beard, the clothing) and the essential (the profound, the philosopher, the monk), the latter being independent from and unchanged by the former. Berliner questions this dichotomy. As an anthropologist, he reviews many situations in which humans wear masks or use other techniques to cover their identities: cosplaying, puppy play, historical reenactments, live-action role-playing, and the use of pseudonyms. Cosplayers, the subject of Berliner's first case study, impersonate characters from movies or video games. On the basis of lengthy interviews, he concludes that role-players change when they wear the costumes of their favorite heroes, behaving, for instance, with more self-confidence. A little psychological experiment not cited in this book suggests the same. In 2012, Hajo Adam and Adam Galinsky asked a...

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