Feng Shui is based upon the existence of "Qi" (pronounced 'chee'). Qi (sometimes spelled as Chi) is invisible energy that surrounds us at all times. You may not always able to see it, but it can be calculated!
The flow of this invisible energy (Qi) in our surroundings profoundly affects the way things unfold in our lives.
We each choose our homes and work spaces for conscious and unconscious reasons. We find ourselves in a house, apartment, office or mansion for good reasons. Issues in the place we occupy often mirror the issues we are currently facing.
The essence of Feng Shui is to activate the positive "Qi" in your environment, cure any negative "Qi", and create the right quality of energy to support your goals and dreams.
Changes in an environment (usually referred to as 'cures' or 'remedies') are accomplished in a variety of ways which may include changing how you use the space, which bedroom or office you use, artwork, colors used, lighting, water features and 'yes' - the placement of furniture. The most effective 'cures' are those which involve changing how you use your space or using the items you already have in your own home or office.