Vastu Shastra is an ancient Hindu science that dates back to the Vedic period, around 1500 BCE. It is based on the concept of Vaastu, which means "building" or "structure". Vastu Shastra is a holistic approach to designing and building structures, considering the spiritual, physical, and mental well-being of the occupants.

Key Principles of Vastu Shastra:

• Directional Alignment: The alignment of a building's entrance, door, and windows is crucial. The entrance should be aligned with the cardinal directions (north, south, east, and west) to ensure proper flow of energy.
• Color and Material: The color and material used in construction can affect the energy of a building. For example, the use of red sandstone is believed to bring good luck and prosperity.
• Shape and Size: The shape and size of a building can influence the flow of energy. For example, a square shape is considered more auspicious than a rectangular shape.
• Light and Shadow: The use of light and shadow can create a sense of balance and harmony in a building. For example, the use of mirrors can create the illusion of more space.
• Plants and Nature: The use of plants and natural elements can bring balance and harmony to a building. For example, the use of greenery can purify the air and create a sense of calm.

Vastu Shastra also emphasizes the importance of balance and harmony in all aspects of life. It teaches us to create a balance between our physical, mental, and spiritual needs.