The bagua - a map of energy
The bagua is a map of how energy moves within a defined space. It is a template divided into nine areas which can be laid over a plan of your plot of land, house, apartment - even the individual rooms.
Each of the nine areas, or "houses", of the bagua has a certain set of characteristics that gives clues to what is happening in your life and how this mirrored in shape and interior design of your home. There is a certain predictable pattern to the way energy moves around a place which has been observed over thousands of years. When the invisible energy moves into the area of the bagua known as Earth, for example, its impact in the physical world involves a relationship issue. In a similar way, any disturbances to the flow of energy in the area of Wind will affect the inhabitant's fortune and finances. Each house of the bagua has many different qualities. It is named according to the trigram from the I Ching with which it is associated, and is given one of the first nine cardinal numbers.
The bagua is always oriented front the front door of your home or the main doorway into a room. Even if you rarely use your front door and always enter your house from the back, you shoulkd still use your front door to position the bagua; only use the other door as your "front door" if you absolutely never open the acknowledge one. Using the grid of magic numbers that comprise the bagua, line up the template on your floor plan so that your door enters through the grid somewhere along the areas Mountain, Water or Heaven.
Although the bagua is most powerful for the ground-floor layout of a building, its storey has its own bagua, which is aligned by using the top step onto the landing as the "front door", and then pulling back the edge of the bagua to the outside wall of your home. Remember too that you can apply the bagua to any room in your house and also that doorways without doors can also be entrances. Sometimes, a room will have more than one entrance; as a crossroads room it could have three or four. You should align the bottom of the bagua with the doorway most frequently used: the door leading from the kitchen to th edining room might take precedence over the one from the living room, for example.
When evaluating your home, place the bagua over the ground-floor plan of the house to see if there are any sections missing, and think about the correlations there are with what is going on in your life. If the whole Relationship/Earth area is missing, have you been finding difficulty with this aspect of your life? When you eventually start to think about making adjustments to the interior design of your home in order to begin to make changes in your life, use the bagua for each room. Consequently, if you decide you want to enhance your creativity, check each Lake area of every room as well as on every storey of the house.
The bagua can be stretched to cover oblong and ackward shapes. As you lay the bagua over your own floor plan, you will begin to get an idea of what is missing, that is, what is called negative space. If it is less than half, than it is counted as a protusion, which means that the prevailing energy of that house the bagua is greater. Bay windows count as small projections.
Irregularly shaped houses with spaces missing should not be viewed as bad or difficult; rather, when you see the adjustments that you can make for each of the nine houses, you will realize that they have tremendous potential.

Summary:
The bagua is a map of how energy moves within a defined space. It is a template divided into nine areas which can be laid over a plan of your plot of land, house, apartment - even the individual rooms.