Vastu believes that there are essentially two types of forces which are equal and opposite in nature. The interaction of these two forces is cosmic ordained and produces a third type of force which is called bioforce or prana needed for life to exist. One type of force is subtle and fine. The other is dark and dense. We can, for sake of understanding this subject, call the first one as positive and the other as negative. pranais liberated by the interaction of these forces.
The Vastu science is founded upon the laws of nature. The equilibrium we observe in the nature is easily perceivable by us in all moving bodies, but unfortunately we are unable to note this equilibrium in static bodies. The basic source of energy of the whole world is stored at North and South Pole. It flows uninterruptedly from North Pole to South Pole in the form of magnetic waves. Therefore Southward portion of every building should be higher than the northward portion so that there may not be any hindrance to the flow of magnetic waves.
The cars are so accurately balanced that even deflation in any one of the tyres can cause a serious accident. Similarly, when a building is constructed without observing the rules of Vastu science, various calamities, diseases, accidents can occur. This is the eternal rule of the nature and it has no place for any logic, doubt or debate.
Over the surface of the globe these forces continuously interact releasing bio-energy. When a structure is built over the surface of the earth it comes in the way of a natural interaction. Both the forces enter the structure where the interaction continues. However, the intensity of forces that enter the structure need not be the same. Depending on various factors like levels, water bodies, door placement etc., either the positive or the negative can have stronger presence.
If the structure is so designed that the positive forces override the negative forces then there is a beneficial release of bio-energy which helps all the inmates to be healthy. Even after such reaction with the negative forces a positive cosmic surplus is always present in such a structure which is the Supreme Being Himself. In such an atmosphere life is smooth and happy with every thing in life coming your way without any great struggle. It is a happy and healthy life for all the inhabitants.
If on the other hand the structure is built in such a manner that the negative forces override the positive then you have a weak bio-energy field which manifests as diseases in the occupants.The over bearing negative field makes your actions, efforts, thinking negative so that ultimately the whole life is ruined.The science of Vaastu guides you about the rules you have to follow so that the structure has a positive atmosphere.