Vaastu Shastra elaborates the basic sense of designing the architecture of buildings and specific areas of a building such as rooms, gates etc.
The motive of Vaastu Shastra is to enhance the well being of the occupants.
It primarily instructs how to maintain the equilibrium of the five elements ( Earth Water, Sun, Air & Space) in a building and to make the best use of their effects to energize the mental & physical energies of inhabitants.
Vastu Shastra combines all these five elements (panch mahaa bhuta ) earth, sky, air, fire, water. And balances them, with the person (inhabitant of the dwelling )and the material used for construction.