There are various forms of mandalas with distinct concepts and different purposes. The individual representations range from the so-called Cosmic Mandalas, which transmit the ancient knowledge of the development of the universe and the world-systems which represents a high point among Mandalas dedicated to meditation; to the Mandalas of the Medicine Buddha which demonstrates how the Buddha-power radiates in all directions, portraying the healing power of the Buddha.
The symbolism of meditation Mandalas has a rich tradition. The outer form of these so-called holy circles is a geometrical diagram, a Yantra, and each detail of its construction has symbolic meaning. The essence or purpose of the Mandala is concerned with the process of invocation, the calling in and realization of the spiritual force within the contemplator himself. All these different picture-tools have essentially the same inner meaning and purpose, but there are mandalas to suit all levels of consciousness: for the spiritually highly developed, for average people and for people not yet developed.
The Cosmic Mandala is encompassed by a flaming circle. At the Centre is a three-footed spiral symbolizing a first movement, surrounded by rotating wind which condenses into so-called basic elements, representing the states of aggregation: Wind or Air stands for the gaseous state; Fire is usually depicted as a red triangle and stands for transformation; Water for liquid, represented by a half-circle or circle; Earth for solid matter, symbolized by a yellow square or cube. The emerging forms of the elements are painted in the blue ring surrounding the Centre, in the lower sphere intimating the world-continents to be. The blue Ether represents the all pervading condition, the source of all elements filling the space of the Mandala. On it circles are drawn; looking like ellipses in their dynamic intersection, they portray the orbits of celestial bodies, painted in all the colours of the rainbow plus black and white and indicating the directions. These twelve astrological circles of the upper sphere demonstrate the movements of sun, moon and stars in the seasons.
Tibetan monks constructing a festival mandala with sand and the dust of precious stones. After the festival the mandala will be destroyed, thus expressing the insubstantiality of visible forms.
See The Kalachakra Mandala - the Wheel of Time Sand Mandala and His Holiness the Dalai Lama's explanation of the practice in the Kalachakra Initiation.
Traditionally the Kalachakra Initiation
has been a closely guarded secret and the viewing of the mandala forms
the culmination of a twelve day initiation ritual for Tibetan Buddhist
practitioners. However, the Dalai Lama, recognizing the many misconceptions
surrounding Tibetan Buddhist practice, began presentations of the
Kalachakra Sand Mandala to the general public as a cultural offering.