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A Yantra (pictured above) is a mystical diagram from the Tantric tradition of the Indian religion Hinduism. The yantra typically has several geometric shapes radiating concentrically from the center, including triangles, circles, hexagons, octagons, and symbolic lotus petals. The outside often includes a square representing the four cardinal directions, with doors to each of them. Yantras can be on a flat surface or three dimensiona and can be drawn or painted on paper, engraved on metal, or any flat surface. They tend to be smaller in size than the similar mandala, and traditionally use less color than mandala. They are used for the worship of deities in temples or at home; as an aid in meditation; adornment of temple floors. Specific yantras are traditionally associated with specific deities. As an aid to meditation, yantras can represent the deity that is the visual object of meditation, just as a mantra represents is the mental object of philosophical focus.