The Yantra provides a
focal point that is a window into the absolute. When the mind is
concentrated on a single, simple object (in this case a Yantra), the
mental chatter ceases. Eventually, the object is dropped when the mind
can remain empty and silent without help. In the most advanced phases,
it is possible to attain union with God by the geometric visualization
of a Yantra.
The Yantra is like
a microcosmic picture of the macrocosm. It is a focusing point and an
outer and inner doorway. The Yantras are often focused on a specific
deity and so by tuning into the different Yantras you can tap into
certain deities or creative force centers in the universe.
Yantras are usually
designed so that the eye is carried into the center, and very often
they are symmetrical. Yantra can be drawn on paper, wood, metal, or
earth, or they can be three-dimensional.