The powerful Thoth Tarot deck was designed by Aleister Crowley, an influential and controversial occultist of the early 20th century. He worked on the deck from 1938 to 1943. This deck was created to illustrate Crowley's The Book of Thoth. The artist is Lady Frieda Harris. She worked with Crowley's rough sketches to produce images that would be faithful to his interpretations and her own vision.
The illustrations of the Thoth deck are rich in symbolism, based upon Crowley's stated desire to incorporate symbols from many disparate disciplines, including science and philosophy, as well as to draw on his extensive knowledge of various occult systems.