About B.T.B.
Black Sect feng shui operates on two levels, sying and yi.
Sying encompasses the tangible environmental factors of feng shui: it denotes the external elements—energy (chi) of land, shape and structure of houses and columns, juxtaposition of doors, furniture placement—that contribute to the feng shui of a place to determine one’s luck. Traditional feng shui schools mostly emphasize sying—literally "shapes"—and directions.
While not rejecting these traditional methods, the Black Sect includes an additional instrument to harmonize the environment: the channeling and balancing of Chi. My theory, besides embracing sying, also includes something extra: yi. Yi—loosely translated as a wish, a will, or an intention—plays an important role in Black Sect feng shui. Yi is a blessing, a way of adjusting and enhancing chi through intuition and imposition of the will of the expert (and the will of the client) on a house or a person. It is a vital but intangible process—a positive transference and transformation of energy (chi)—that reinforces and blesses the physical aspect (sying) of feng shui.
http://www.fsdi.com/articles/blacksect.htm