Book excerpt: Tourists, terrorists, secularists, hackers, fundamentalists, transhumanists, algorithmicians: in this book Roberto Calasso considers the tribes that inhabit and inform the world today. A world that feels more elusive than ever before. This book, the ninth part of a work in progress, is a meditation on the obscure and ubiquitous process of transformation happening in societies today, where distant echoes of Auden's The Age of Anxiety give way to something altogether more unsettling.