Lithomancy is a form of divination by which the future is told using stones or the reflected light from said stones. The practice is most popular in the British Isles.
The earliest verified account of lithomancy comes from Photius, the patriarch of Constantinople, who describes a physician named Eusebius using a stone called a baetulum to perform the ritual. However, some writers also claim that Helenus predicted the destruction of Troy using the ritual.
In modern lithomancy, 13 stones are tossed onto a board and a prediction made based on the pattern in which they fall. The stones are representative of various concepts: fortune, magic, love, news, home life and the astrological signs of Mercury, Venus, Mars, Jupiter, Saturn and the Sun and Moon.