Vaastu Shastra is an ancient mystical science which has all the rational values to be implemented in the modern era. Based upon the forces of nature or the energies prevailing in the environment, Vaastu Shastra observes the Earth as a large magnet with two strong magnetic poles - North Pole and South Pole. The basic sources of energies in the environment or the 5 elements - Earth, Water, Air, Fire and Space known as 'Paanchbhootas' guided by the magnetic waves that moves uninterruptedly from North Pole and the South Pole. This theory is implemented in Vaastu for the construction of buildings by always designing the southern part of a building to be at a higher level than the northern part. This is done to facilitate the smooth flow of magnetic waves without any hindrance.

The rationality of Vaastu and its scientific implementation includes the idea and hypothesis of architectural expertise for the design and construction of a building including the placement of entities in the house and the lifestyle of the inmates. Vaastu Shastra as a science of building and architecture makes full utilization of the energies present in the environment as a guideline for building houses so as to bring good health and prosperity to its occupants and also prolonged life to the structure by withstanding the forces of nature. Vaastu stresses on the placement of energy sources in the right direction.

Though there are energies prevalent in the atmosphere, the three most significant forces are Water, Air and Fire. Vaastu Shastra emphasizes on the placement of these energies in proper section of the house to create harmony among the elements. Proper utilization of the elements of nature bring peace, health, wealth prosperity and the worldly pleasures. But if one of the elements is wrongly placed in place of another element, the energies from the elements are bound to conflict and create disturbance and disharmony.

The design structure in Vaastu is based in three principles either for construction of building, technique or the entities to be used and placed in the house. The three principles are also based on the critical feature of the structure applicable both for the interiors and exteriors.

• Bhogadyam: This principle of Vaastu is based on the concept of usefulness as well as simple application. It stresses on the availability of sufficient space for easy mobility in a house as well as useful application of an entity with more productivity.
  
• Ramya: This principle is an important part of the Vaastu as emphasizes on the spiritual impact a product or entity can have on the occupants of a house. It is believed that things that bring peace, contentment and evokes a perception of fulfillment are most suitable to be place or implemented in a house. This not only brings peace and harmony the environment or dwelling but also creates an aura for positive energies which may bring about prosperity and complete well-being in life.
  
• Sukha Darshan: This principle of Vaastu stresses on the aspect of making a structure or placement of an entity visually appealing and aesthetically pleasing; showering positive impact on the occupants of the house. Sukha Darshan extends its influence on the designing of both the interior and the exterior of a structure. Apart from color schemes which is an important appealing factor for occupants, the décor, ornamentation and layout of the entities also have contributing effect on the life of persons residing in a house.