The companion to Astra Taylor’s documentary film, the book features interviews with eight iconoclastic and influential philosophers, conducted while on the move through places that hold special resonance for them and their ideas. Peter Singer’s thoughts on the ethics of consumption are amplified against the backdrop of Fifth Avenue’s posh boutiques. Slavoj Zizek questions current beliefs about the environment while sifting through a garbage dump. Michael Hardt ponders the nature of revolution while surrounded by symbols of wealth and leisure. Judith Butler and a friend stroll through San Francisco’s Mission District questioning our culture’s fixation on individualism. And while driving through Manhattan, Cornel West–perhaps America’s best-known public intellectual–compares philosophy to jazz and blues, reminding us how intense and invigorating the life of the mind can be.