Gazing Balls

Crystallomancy, or crystal gazing, is a method of divination of distant or future events by gazing into a crystal or a ball of polished rock crystal. In popular media, a crystal ball is often used. more...

Among objects used are a pool of ink in the hand (Egypt), the liver of an animal (tribes of the North-West Indian frontier), a hole filled with water (Polynesia), quartz crystals (the Apaches and the Euahlayi tribe of New South Wales), a smooth slab of polished black stone (the Huille-che of South America), water in a vessel (Zulus and Siberians), a crystal (the Incas), a mirror (classical Greece and the middle ages), the fingernail, a swordblade, a ring-stone, a glass of sherry, in fact almost anything.

Read more at Wikipedia.org