The second sight is an impression made either by the mind upon the eye, or by the eye upon the mind, by which things distant or future are perceived, and seen as if they were present. A man on a journey far from home falls from his horse, another, who is perhaps at work about the house, sees him bleeding on the ground, commonly with a landscape of the place where the accident befalls him........ Things distant are seen at the instant when they happen. Of things future I know not there is any rule for determining the time between the sight and the event.

Johnson from 'A Journey to the Western Islands of Scotland' and 'The Journal of a Tour to the Hebrides' by Samuel Johnson and James Boswell