Many people have held the idea that the Tarot has its origins in the Kabbalah although there is no firm historical evidence for this. The work of the 19th century French occultist, Eliphas Levi, was the catalyst for the study of the esoteric link between the Tarot and the Kabbalah, which became the main model for the development and modern interpretation of the Tarot. The most influential decks of the 20th century were founded on Kabbalistic principles, in terms of their structure, their symbology and their explication.