A series of cards used in ESP testing where a subject tries to determine or “guesses” a card being viewed by a tester or predicts the next card. With an open deck any particular card may be drawn at any time, leading to multiple appearances of some cards, few appearances of others, and possibly some cards not appearing at all. Statistical analysis of tests run using an open deck uses different protocols than testing using a closed deck. (See “Closed Deck.”)
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...