Speaking, Yantra means "machine" or "contraption". Prime among the Yantras is the Sri Yantra, a 12,000-year-old mystical symbol which is considered the "mother of all Yantras". What is that, you ask? Well, part of the mathematical allure is the fact that you see it all around you in nature, and that is nowhere as true as in the case of the magical number: 1.1618, better known as the Golden Proportion. Every natural pattern is composed regarding this ratio.