Bellaire, TX: Uac-Kan, 1984. The fruit of twelve years research including 14 months residence at Teotihuacan. Harleston's analysis of over 9,000 dimensions permitted identification of the basic unit of measure and its relationships, including the enneagramtic series (1-4-2-8-5-7) whose multiples are found in the design. Harleston joined Gurdjieff groups in..... More about THE KEYSTONE: A SEARCH FOR UNDERSTANDING. A NEW GUIDE TO THE GREAT PYRAMIDS OF MEXICO.