Yantras are not geometrical diagrams imagined by some artist. They are the mathematical or scientific equations or scientific symbols of everything that is existing in this world, in this universe, in this material form.
This body is my gross form, but I have another form in this universe. That is called yantra. I have a yantric form. Every element, every visible and invisible thing, the sun and the moon and the planets, the great oceans and the mountains, the forest and the animals, say anything you like, everything has a different form, and that form is known as yantra. Yantra therefore represents matter and space at the same time.
9 March 1985, Conway Hall, London, UK