The symbolic role of classical music through "rāga" has been both aesthetic indulgence and the spiritual purifying of one's mind (yoga). The former is encouraged in Kama literature (such as "Kamasutra"), while the latter appears in Yoga literature with concepts such as "Nada-Brahman" (metaphysical Brahman of sound). "Hindola rāga", for example, is considered a manifestation of Kama (god of love), typically through Krishna. "Hindola" is also linked to the festival of "dola", which is more commonly known as "spring festival of colors" or Holi. This idea of aesthetic symbolism has also been expressed in Hindu temple reliefs and carvings, as well as painting collections such as the ragamala.