The film is based on "The Ascent of Mt. Carmel" by St. John of the Cross and "Mt. Analogue" by Rene Daumal.
• Before filming began, director Alejandro Jodorowsky spent a week without sleep under a Zen Master's direction and lived communally with the film's cast for a month.
• At a projected budget of $1,500,000 (in USA dollars), it was to have been the most expensive Mexican film production to date...