Probably it would be extremely optimistic and naive to believe that the deepest knowledge about Sri Chakra has a root in oral period of human civilization covering 20,000 -1,500 BC. More realistic point of view is closer to our usual imagination of ancient times. The best search of its origin approximately could be set in Asia in period 1,500 BC – 8 AD. As far as I can see, 5th century BC and later.
Two millennia had been elapsed and hand-painted Sri Yantras were accepted by Asian and Western museums. In the second part of XX century some American scientists tried to find mathematical formulas but without discovery the main principles of construction of star polygons. As a branch of modern mathematics 14 and18-pointed star polygons is still a blank page in reference books and encyclopedias.
Recently in the paper edition only one exact graphical scheme of Sri Chakra can be named, as it seems to me: published by Indian scholar who had been led his study in Mukambika shrine in Kollar near Bangalore, Karnataka, South India, and it gives us probably the best historic and philosophical explanation in religious framework. Unfortunately, it will be very hard to accept this partially geometrical picture as a piece of art and a tool for meditation.
Collection of Sri Yantra and More Difficult Star Polygons performed by me in 1994-95 consists of two variations 14-pointed and nine (!!!) variations of 18-pointed star polygons previously unknown for public and specialists. I would like to suggest results of my meditation with paper and ink for people whose knowledge of the world is deeper than it usually seems passing through everyday routine in the streets, avenues, buildings, offices and so called private life.