The methods to activate these latent powers include meditation and recitation of mantras or formulas (elsewhere, yoga is another method). The power can also be transferred to objects, especially diagrams known as yantra (, "lek yan"). In India, where they probably originated, such diagrams are composed mostly of geometric shapes with symbolic meanings arranged in symmetrical patterns (the mandala is a yantra). In the Thai tradition, these diagrams also include numbers in sequences with supernatural meaning, pictures of gods and powerful animals (lion, tiger, elephant), and formulas or abbreviated formulas written in Pali or Khmer. To have power, these diagrams have to be drawn by an adept under strict rules (such as reciting formulas continuously, completing the drawing in one sitting), and activated by reciting a formula.