Imagine the vāstupuruṣa lying face down on the diagram with his head in the north-east and his feet in the south-west, held down by the gods who occupy the padas; do not place walls, pillars or doors on his vital points.
The myth tells of a formless being who blocked heaven and earth until the gods pressed him to the ground, each settling on a part of his body; he was granted that he would be honoured whenever anything was built. Building on a site is therefore a ritual act of ordering, and the diagram is both a map of the cosmos and the body of the site itself.
The marmas (the vulnerable points of the body where lines of the diagram cross) are to be kept free of structure. The north-east, where the head lies and where the god Īśa has his seat, is the most auspicious corner.
Set a vertical rod at the centre of the levelled site, draw a circle round it, mark where the tip of its shadow crosses the circle before and after noon, and join the two marks: that line runs east–west.
E–W = chord through the morning and afternoon shadow points; N–S ⟂ through its midpoint
The cord stretched along the diagonal of a rectangle produces as much area as the cords along its two sides together; use this to set out right angles and to make squares of any required area.
d² = a² + b²; e.g. cords of 3, 4, 5 or 5, 12, 13 units
Divide the square site into a grid of equal squares (padas), most often 8 × 8 = 64 or 9 × 9 = 81, and place every part of the building according to the grid.
64 padas (maṇḍūka) or 81 padas (paramaśāyika)
Read the diagram from the centre outward: Brahmā at the heart, then a ring of the gods, a ring of human concerns, and on the outside the lesser spirits; the holiest function goes at the centre and the most worldly at the edge.
81 padas = 9 (Brahmā) + 16 + 24 + 32
Place the garbhagriha (the small dark chamber that houses the image) over the Brahmasthana, with its walls on the ring of the gods and its door on the axis, usually to the east.
Provide a path for circumambulation (pradakshina) in the clockwise direction, keeping the sacred object on the right, and enclose it with a railing that separates the sacred ground.
Cite this page Chris Paton, “The being of the site”, The Textbook of Architecture, https://textbookofarchitecture.com/rule/vastu-purusha. Text, drawings and models licensed under CC BY-NC 4.0.