These philosophers, together with Simone de Beauvoir, Edmund Husserl, Karl Jaspers, Albert Camus, Maurice Merleau-Ponty and others, seem to me to have participated in a multilingual, multisided conversation that ran from one end of the last century to the other. Many of them never met. Still, I like to imagine them in a big, busy café of the mind, probably a Parisian one, full of life and movement, noisy with talk and thought, and definitely an inhabited café.