You could follow it from there by looking at the empty spaces in a solid line of trees, the rootballs waving their witchy root toes in the air.

WSJ: Anna Quindlen on a Message Delivered by Tornado | House Call

This exploits one of the predictions of Einstein's general theory of relativity: that the path of a beam of light (which is a straight line in empty space) is bent inwards by the gravity of a massive object.

ECONOMIST: Cosmology: I spy with my little gravitational lens | The

The confidence of the home side was visibly growing, and Nicky Wroe even went for goal from the half-way line, punting a long range effort beyond the empty Burton goal with Deeney stranded.

BBC: Torquay 2-1 Burton