in general, vajrayana buddhism, bön, and tantra utilize sophisticated visualization or "imaginal" (in the language of jean houston of transpersonal psychology) processes in the thoughtform construction of the yidam sadhana, kye-rim, and dzog-rim modes of meditation and in the yantra, thangka, and mandala traditions, where holding the fully realized form in the mind is a prerequisite prior to creating an 'authentic' new art work that will provide a sacred support or foundation for deity.