It is not only any practice but a key practice in Yoga, Sri Vidya and Kashmir Sivaism. You find it in the core of Sri Yantra.
Transforming negativity, - in your heart, in your speech and in ajjna - senses and chitta -into your natural state of love.
Om aim glaum varaha mukhi varaha mukhi!!!
Give all your pranam & devotion.
Thank you for this video