"By what seemed then and still seems a chance, the suggestion of a moment's idle thought followed up upon familiar lines and paths that I had tracked a hundred times already, the great truth burst upon me, and I saw, mapped out in lines of sight, a whole world, a sphere unknown; continents and islands, and great oceans in which no ship has sailed (to my belief) since a Man first lifted up his eyes and beheld the sun, and the stars of heaven, and the quiet earth beneath. You will think this all high-flown language, Clarke, but it is hard to be literal. And yet; I do not know whether what I am hinting at cannot be set forth in plain and lonely terms. For instance, this world of ours is pretty well girded now with the telegraph wires and cables; thought, with something less than the speed of thought, flashes from sunrise to sunset, from north to south, across the floods and the desert places. Suppose that an electrician of today were suddenly to perceive that he and his friends have merely been playing with pebbles and mistaking them for the foundations of the world; suppose that such a man saw uttermost space lie open before the current, and words of men flash forth to the sun and beyond the sun into the systems beyond, and the voice of articulate-speaking men echo in the waste void that bounds our thought. As analogies go, that is a pretty good analogy of what I have done; you can understand now a little of what I felt as I stood here one evening; it was a summer evening, and the valley looked much as it does now; I stood here, and saw before me the unutterable, the unthinkable gulf that yawns profound between two worlds, the world of matter and the world of spirit; I saw the great empty deep stretch dim before me, and in that instant a bridge of light leapt from the earth to the unknown shore, and the abyss was spanned."
-- Arthur Machen, The Great God Pan.

[The Great God Pan was apparently written in 1890, although revised and expanded in 1894. This seems a remarkable choice of analogy, especially if it was in the original version. The first public demonstration of wireless telegraphy was in 1894.]