The diagram is a grid of 3 by 3. Each square has a number and if horizontal, vertical or diagonal rows add up the sum that always gives 15. Similarly, each number has a color, an element and plays a role in the harmony of the home. This square is called the magic square or Luo Shu square and in which the Feng Shui are based, to keep the harmony. To work with Feng Shui, we must first locate the magic square whose base contains the entry of the house or room.