The word vastu in sanskrit means 'vas'. It means a place of residence, a nature, a surrounding or environment that encloses within itself as supreme force. That effect of this force can only be experienced in our lives. Vastu shastra is governed by sun moon and nine planets.
The gravitational force, magnetic force and five elements: fire, water, earth, sky and air and perfect harmony of cosmic rays that helps the human body and mind to lead a cheerful healthy and contended life. If they are not respected and messed with it can also cause imbalance in human lives.