Philosophical innovation from, say, the Enlightenment (i.e. from the mid-18th century) to the Seventies has focused upon a set of concepts which I've been calling, for the sake of brevity, utopia. Sure, calling it "utopia" means that, when I suggest that the historic period cited above was the Age of Utopia, I need to clarify what I mean by utopia if I am to have an audience at all. Utopia, as discussed here, is the intersection of human desire and human world-picture.