Listen to this essay 25 minute listen On 29 October 1945, the philosopher Jean-Paul Sartre emerged alone from the Paris Métro. He was about to deliver a lecture titled ‘L’existentialisme est un humanisme’ (‘Existentialism Is a Humanism’) at the Club Maintenant. No one had any idea it was going to become one of the most famous lectures of the 20th century. As Sartre walked towards the venue, he saw...