"We are concerned no longer with cultural inflections, but with a passage from one culture stage to another. In all previous ages, only restricted portions of the surface of the earth were known. Men looked out from the narrowest, upon a somewhat larger neighborhood, and beyond that, a great unknown. They were all, so to say, insular: bound in. Whereas our view is confined no longer to a spot of space on the surface of this earth. It surveys the whole of the plane. And this fact, this lack of horizon, is something new."
Leo Frobenious in Monumenta Terrarum (1929)