Vastushastra is an ancient Indian science that deals with the design and architecture of buildings in accordance with the laws of nature. It is believed that following the principles of Vastushastra can bring harmony, prosperity, and well-being to the inhabitants of a building. The principles of Vastushastra are based on the alignment of the building with the five elements of nature - earth, water, fire, air, and space. It also takes into consideration factors such as direction, location, and energy flow within the building. Vastushastra is commonly used in the construction of homes, offices, and other buildings in India.