Castaneda, who disappeared from the public view in 1973, began in the last decade of his life to organize a secretive group of devoted followers. His tools were his books and Tensegrity, a movement technique he claimed had been passed down by 25 generations of Toltec shamans. A corporation, Cleargreen, was set up to promote Tensegrity; it held workshops attended by thousands. Novelist and director Bruce Wagner, a member of Castaneda’s inner circle, helped produce a series of instructional videos. Cleargreen continues to operate to this day, promoting Tensegrity and Castaneda’s teachings through workshops in Southern California, Europe and Latin America.