Part - III
Vastu stands in Earth. Earth depends on water-water is balanced by Agni, Agni is controlled by air (either). Air movements are possible in Akasha. Similarly the Purusha - living beings. The body (earth) depends the water. Contents in the body balanced by the Agni (98.6 Degree in the body). Agni-heat is controlled by the air. Breathing which is possible only if we are having space(Akash) inside the human body.
Therefore Vasthu called as Vastu Purusha Mandala. So the Vasthu and the building must be considered as a lively place and structure, became it will be having all the qualities and drawbacks of the earth so as in the Sourayudha.
Now all the ingredients or parts of Sourayudham directs to the Sun. the face is to the centre of the Sourayudham ie Eath as a mass directs to or makes darshan to the Sun.
Continents to its center
Country to its center
Similarly State, Village to their center.
Therefore each Vasthu as whole in the village to the center of the village, but the part and places of the Vasthu direct to the center of the vasthu which is called the Nabhi or brahmasthram of Vasthu.
If we consider one vastu all the materials or contents facing towards the center of Vasthu which means whatever the West faces, East, South-North, West-East,North-South.