Mandala literally meaning a circle is a Tantric meditation device. It is a visual aid  for concentration and introvertive meditation leading to the attainment of insight and to activation of force culminating in "Siddhi" supernatural forces. The mandala is the graphic representation of this process. It is not only theory but is also practical as an operation scheme with a clear plan for practical realization of the process within oneself. There are many types of mandala depending upon nature of the central deity. The most classic pattern of mandala is Dhyani Buddha.This pattern appears in the oldest tantrics, the mandala represents "Palace of purity" a magic sphere cleansed of spritual obstacles and impurites. The square of the "sacred palace"is enclosed in multiple circles of flame, vajra, eight cemetries lotus.