India Vastu : Vastu Purush Mandala

What is Vastu Purush Mandala?
There are two specific aspects covering Vastu Purush Mandala. Vastu Purush is the mystical or spiritual lord of a Mandala or the enclosed ground area, wherein he lies with his face down. The Mandala is a cosmic diagram of the enclosure where Vastu Purush manifests. Vastu Purush identifies the importance of an area by placing his head to the north-east (balanced thinking) and his lower body to the south-west (stability and strength). His navel is in the center of the area (cosmic awareness) and his hands to the north-west and south-east (movement and energy). Vastu Purush is space personified and he is said to have been born from Lord Siva's perspiration, when the Lord fought the demon Andhaka and ultimately killed him.
The diagram bellow, known as Vastu Mandala, illustrates how the Vastu Purusha was pinned down by Brahma and the 44 Gods – face down, with his head to the North East and feet towards South West. It is divided in to 9×9 = 81 parts. These Gods rule various aspects of life and have certain inherent qualities. Hence while constructing a building, the purpose/function of a room must be in tune with the nature of the deity placed and ruling that part. This is illustrated in the next picture. Not many houses are likely to have that many rooms.
Hence adjustments can be made by combining several areas. One noteworthy point is that in the olden days the central portion ruled by Brahma was kept open.

Picture of Vastu Mandala