The Double by Jorge Luis Borges — Read

Suggested or stimulated by reflections in mirrors and in water and by twins, the idea of the Double is common to many countries. It is likely that sentences such as A friend is another self by Pythagoras or the Platonic Know thyself were inspired by it. In Germany this Double is called Doppelgänger, which means 'double walker'. In Scotland there is the fetch, which comes to fetch a man to bring him to his death; there is also the Scottish word wraith for an apparition thought to be seen by a person in his exact image just before death. To meet oneself is, therefore, ominous. The tragic ballad ‘Ticonderoga' by Robert Louis Stevenson tells of a legend on this theme. There is also the strange picture by Rossetti (‘How They Met Themselves') in which two lovers come upon themselves in the dusky gloom of a wood. We may also cite examples from Hawthorne (‘Howe's Masquerade'), Dostoyevsky, Alfred de Musset, James (‘The Jolly Corner'), Kleist, Chesterton (‘The Mirror of Madmen'), and Hearn (Some Chinese Ghosts).

The ancient Egyptians believed that the Double, the ka, was a man's exact counterpart, having his same walk and his same dress. Not only men, but gods and beasts, stones and trees, chairs and knives had their ka, which was invisible except to certain priests who could see the Doubles of the gods and were granted by them a knowledge of things past and things to come.