A yantra is a geometrical pattern made of several concentric figures (squares, circles, lotuses, triangles, point). The point (bindu) at the center of the yantra signifies unity, the origin, the principle of manifestation and emanation. A yantra is the yogic equivalent of the Buddhist mandala.
When these concentric figures are gradually growing away from its center (bindu) in stages, this is for human beings a symbol of the process of macrocosmic evolution.
When they are gradually growing towards its center, this is for human beings a symbol of the process of microcosmic involution.
Ref By PINREST