Bhagavath Githa refers to the material world as one which is in the form of an inverted pyramid. ūrdhva-mūlam adhaḥ-śākham (bottom on top and branches going down). Similar to human brain and the rest of the central nervous system. Sri Chakra, which is supposed to be the theoretical (geometrical) representation of a life form, is also depicted as an inverted pyramid in it’s three dimensional (meru) form. Hopefully reasoning the two triangles (facing each other - like ✡) to form the union of both meta-physical and physical aspect of life forms. Per eastern philosophy the two triangles (outer large ones) in Sri Chakra also represents the Goddess, mother nature herself, within which the rest of the triangles are illustrated. Don’t miss the inverted one.