Sacred Geometry is a metacognitive practice of drawing forms that arise out of the point of a compass and straightedge, 

to begin:  

With a compass create a circle of any dimension.  

This circle represents a sphere

the Void 

you are the point of the compass 

you are at the center of the void 

there is nothing that you can see, 
there is nothing that you can hear, 
there is nothing that you can smell,
there there is nothing that you can taste, 
there is nothing that you can feel, 

and yet 

there you are

move your bindi point, your focus, the point of your compass to any point on the surface of that sphere, and pierce that boundary with the point of your compass

change occurs at the boundaries

create a second circle of equal diameter, a mitosis, a daughter cell

The second circle defines an intersection of two sets, a union, the vesica pisces, the mandorla, the bladder of a fish, the eye of horus 

the practice of drawing sacred geometry alters your consciousness over time

of the intersections of this union reveals

your frame of reference, the axis mundi, your connection between heaven earth, the eye of horus, the zero energy point, the planck limits, the mathantics of geometry, equilateral triangles, square roots .... 

the node and vector framework of reality

this framework, the Jewels of Indera, extends in three dimensions, to the boundaries of your box, the extent of your universe, to your defination of god