Mandala is a circle which is a device for the Tantric meditation. It is a
visual aid for concentration and introversive meditation leading to the
attainment of insights and to activation of forces culminating in
"Siddhi" supernatural forces. The Mandala is the graphic representation
of this process. It is not only theoretical but practical also as an
operational scheme involving a clear plan for practical realization of
the process within oneself. It thus becomes an instrument (Yantra).