The Bagua is always used for guidance in life analysis, both in Compass School Feng Shui and the Black Sect Tantric Buddhist School of Feng Shui. It is an octagon shape that contains nine areas, eight guas and the center (or Ming Tang) that are directly related to nine aspects of life. These articles are written from the Black Sect School perspective. This school uses relative positioning based on the front entry to a business or residence to determine the positioning of the Bagua. That positioning will determine what part of the home relates to what aspect of your life. A home is considered auspiciously shaped when it is balanced, like a square or rectangle. A balanced and regularly shaped home will be energetically complete in terms of the Bagua. Also, the front door as designed by the architect IS the front door, regardless of what door is primarily used.
To use the Bagua, working from a floor plan, overlay it on the shape of the building so that the bottom of the Bagua, called the water line, is placed on the side of the building containing the front entrance. Thus, looking at the Bagua, the entry to your home will be in the Helpful People Gua, the Career Gua, or the Knowledge Gua. As your home is probably not octagonally shaped, square off the Bagua so that you have nine equal spaces. You might think of this as a tic-tac-toe grid. Also, your home is probably not square, so elongate or widen the Bagua or whatever you have to do to capture the majority of your home in this squared off shape. The occasional exception to this alignment process is usually caused by an angled entry, foyer or blocking wall. Feng Shui is traditionally taught via the oral method and there are nuances of placement that cannot be explained satisfactorily in writing. BTB Feng Shui is also intuitive.
Due to the shape of your home, you may have omissions (missing parts) and extensions (extra parts) of the Bagua within your home’s footprint. These would affect the energy of the gua, or area, related to that aspect of your life. A lanai or porch may be one of these, or not; it just depends. A garage is frequently a huge extension. There are many variations in the way homes are built and there is some really bad architecture out there, speaking from a feng shui energy perspective.
You may also use the Bagua on any room in your home; your bedroom is of the greatest importance. This is useful when you are placing object cures with an intention for your desired life enhancements. With experience and attention to nuances, you may also wish use it on your desk top or your car as well as in other ways such as your building lot or condo building.
If you live in a single family home, use this same technique to place the Bagua on your lot. Typically, the side of the lot where the driveway enters your property will determine the front of the lot and thus the placement of the Bagua. If you live in a condominium or an apartment, your unit will be situated in one (or more) of the guas of the entire building. Use the entry to the building for that Bagua and use the entry to your condo or apartment for your personal Bagua.
The Bagua has its own color wheel and each gua is represented by a primary color; sometimes secondary colors. Each gua of the Bagua relates to one of the five elements: fire, earth, metal, water and wood. Each element will be symbolized by its color (sometimes the same as that of the Gua, sometimes not) and its shape. These actual elements, their colors and shapes, may be used with intention to change the energy of your environment.