Not so much props . . .
. . as guides off the beaten path. Both astrological symbology and tarot cards provide a vast selection of complex associations that won't ever be in the same order as before. The mind has to try to reconcile these associations and will be open to ideas and may come up with surprising things as it does so.
Particularly the tarot, while each card carries complex meanings and they all fit into a systematic structure, the sturcture can't actually be systemized completely. Aleister Crowley tried damned hard and admited failure. This guarantees fresh new and different associations among complex ideas every time.
The bad card reader and the bad astrologer are both convinced the tools constitute a rigid structure that must be analyzed precicely in accordance with a set of rules. They completely miss the point.
