What is "Sacred Geometry"?

Wise men over the ages have noted patterns in nature from the largest macrocosmic entities in the cosmos to the tiniest microscopic particles, invisible to the naked eye. You could call them laws of nature. These geometrical blueprints structure all of creation. Each pattern is an architectural foundation for objects in nature and each has unique vibrational resonances. Yet each part is intricately and wondrously tied to the whole of creation - to shape a reality of unity permeating all of diversity.

Buildings are a living organism, like the human nervous system, and can be designed in "harmonic resonance" with the basic underlying energy structure of the universe.

"Space is the fundamental source and energy for all things, for their origination and for their existence. This important scientific concept, the tradition of Vaastu has been holding with it from the Vedic period and, in fact, from the period even prior to Vedic times. It maintains that SPACE itself turns into spatial forms and it has its own mathematical order or dynamics for changing into aural and visual forms. In Indian civilization, all temples, sculptures, architectural constructions ... are the creations by shilpins of the tradition of Vaastu Science. Being born of this tradition, these creations render not only physical pleasure but also spiritual bliss and well being. This spiritual science ... moulds us and directs us to experience the inexplicable spiritual bliss by effecting a communion between its own artistic creations and spiritual consciousness."

"Space is energy filled or energy stuffed. If this energetic space gets limited or enclosed by four walls then the building becomes a living organism, having rhythmic vibrancy. Like the inner space enclosed with-in our bodies, the house also feels and vibrates. This rhythmic vibration is made to resonate with our inner vibrations and by this resonance the indweller of the house is able to be in harmony and communion with the universal space (Supreme Soul) and to experience spiritual bliss.

- Dr. Ganapati Sthapati

You can also check this video to know more.

Reference

http://www.vastu-design.com/