The Thoth Tarot is a divinatory tarot deck painted by Lady Frieda Harris according to instructions from Aleister Crowley. Crowley referred to this deck as The Book of Thoth, and also wrote a book of that title intended for use with the deck.
Crowley originally intended the Thoth deck to be a six-month project aimed at updating the traditional pictorial symbolism of the tarot. However, the project was to span five years, between 1938 and 1943, as its scope grew ever wider. Crowley and Harris were meticulous in their work, and Harris painted some of the cards as many as eight times.The current edition of the U.S. Games Systems deck contains two prototypes of The Magus card as painted by Lady Harris, each making use of markedly different style and symbols. Completed by Lady Harris but then rejected by Crowley, these were never intended to be a part of the deck proper. They are now included as a bonus treat for aficionados of the deck.
Neither Harris nor Crowley lived to see the deck published. The first full publication was by Ordo Templi Orientis in 1969, although this initial printing was seen by many to be of inferior quality, and in 1977 Harris' paintings were rephotographed for a second edition. A further update with new photography took place in 1986, while the current edition is based on a revision of this update which was first printed in 1996.