Making a crystal grid is a powerful method of invoking vibrational energy.
Techniques of High Magic: A Guide to Self-Empowerment, by Francis King and Stephen Skinner
Art and Practice of Geomancy, The: Divination, Magic, and Earth Wisdom of the Renaissance
A distinction is made between these and "energy leys" or leys "which have earth
Although there are hundreds of kinds of divination, the principle ones are astrology, geomancy,