When our early ancestors looked out at the horizon, they believed they were staring at the end of the earth. Ships sailed off the edge, and mystical monsters presided at the boundary. Now we know that the earth is round, that there is no mystical land beyond the hills, but nonetheless we are captivated by that thin line in the distance. It is still the place where the earth touches the sky, and remains forever remote, no matter how many steps we take towards it.
