If You Have Never Thought Gray: A Theory of Color

“You’re not a painter if you haven’t painted gray”, declared Paul Cézanne. The same could be said of philosophers: you’re not a philosopher if you have never thought gray. This simple four-letter word signifies much more than a quasi-neutral color lying between black and white: we use the same word to describe moods, November skies, the hair of the elderly, the withered features of faces, dusty shelves, faceless bureaucracies, dreary politicians and hundreds of other things. This plain, una...