Yantras are generally geological designs imprinted on a copper or silver plate. These days we also see them in multi-colored inks on paper. Among the sacred symbols manifested by the Vedic Rishis, yantras are predominantly regarded as devices for devotional sadhanas or practices, and as objects to direct our mind and worship. These are used as tools for mental concentration and meditation. Keeping a specific yantra in a particular direction in the home, and worshiping it and concentrating upon it is said to have distinct auspicious effects. A mantra is the generator of specific currents of sublime sound and its perceivable manifestation; a yantra is a monogram - a spectrograph of this sonic energy. In terms of their spiritual effects, yantras are like schematic sketches of the contours or structures of divine energy fields.
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