I've always thought of things like Tarot, Astrology and I-Ching to be entirely to do with the brain functions of the operant, rather than any mystic or supernatural force. It's like looking through a prism - different facets are thrown into light or relief. Tarot is especially good because it deals with a set of symbols quite fundamental to the western mind, symbols that are easily interpreted subconciously, leading to a revelation or revelations sourced entirely from the self.

Like inkblots, ya?