In 1858, the anarchist Joseph Déjacque began to serially publish his vision of a future anarchic utopia titled L’Humanisphère. He sketches a hyper-advanced future society free from want and coercion, where humanity and nature coexist harmoniously in an anarchist ecumenopolis. This obvious ecologism, however, rests on the foundations of a highly idiosyncratic ecological understanding of politics generally and utopia in particular. Drawing on the influences of Charles Fourier and Pierre Leroux, I aim to elaborate Déjacque’s utopianism, which emerged directly out of his understanding of nature and humanity’s position within it. Politics follows nature, not the other way around.