Strolling through Hampstead Heath wondering about the differences between heaths and moors (my knowledge of the latter drawn largely from Sir Arthur Conan Doyle’s descriptions of them in the third of his Sherlock Holmes novels, The Hound of the Baskervilles), I observe dogs and magpies exploring hills of grass and gorse. A raven issues two sharp calls from a branch above the path. From there it’s just a short walk to Highgate Cemetery and the Tomb of Karl Marx, where I place a small stone worn smooth by time atop the headstone as a kind of offering. The Social Darwinist philosopher Herbert Spencer, who coined the phrase “survival of the fittest,” lies buried just a few feet away from Marx, the two thinkers locked in permanent struggle on the far side of the River Lethe. But no one treks hundreds of miles to leave flowers and light votive candles in honor of shitbags like Spencer. Anticommunists may have dubbed Marx “the God that Failed” during the early days of the Cold War, but like the spectre invoked in the opening lines of The Communist Manifesto, Marx remains an active presence here in the 21st century — a patron saint of the planet’s dispossessed and prophet of the world to come.