The Trataka: Preparatory Technique for Shambhavi Mudra
Before learning the Shambhavi Mudra, one has to grow the trataka first. As one the shatkarmas (preparatory observances), trataka cleanses and the optic track, as well as strengthen the nerves and muscles supporting the eyes. Trakata involves fixing the eyes at one external object, such as a burning flame, flower, or a spiritual emblem.
Fire is the symbol of our primal energy. For one, the energy we produce and harness in our bodies is predominantly of fire element (agni). Our nervous system has a special relationship with the sacred fire and by meditating upon the fire within and around us, we can powerfully dissolve the senses into the cosmic infinity and eternity.