Tandava (also spelled as ), also known as , is a divine dance performed by Hindu god Shiva. Shiva is depicted as dancing the Tandava in his form of Nataraja. The Natya Shastra, a Sanskrit treatise on the performing arts, describes various aspects of the Tandava. Tandava, as performed in the sacred dance-drama of India, has vigorous, brisk movements. Performed with joy, the dance is called Ananda Tandava. Performed in a violent mood, the dance is called Raudra or Rudra Tandava. The types of Tandava found in the Hindu texts are: Ananda Tandava, Tripura Tandava, Sandhya Tandava, Samhara Tandava, Kali (Kalika) Tandava, Uma Tandava, Shiva Tandava, Krishna Tandava and Gauri Tandava. Tandava mudras and postures occur within the person by itself without volition, if his Kundalini (shakti within) is invoked. Mudras and postures of sculptures in ancient Indian temples are a mere depiction of spirituality (invoked spirit, the kundalini), which actually is supposed to occur in the person as a fruit of his practices. Shiva Tandava is described as a vigorous dance that is the source of the cycle of creation, preservation and dissolution. While the Rudra Tandava depicts his violent nature, first as the creator and later as the destroyer of the universe, even of death itself, the Ananda Tandava depicts him as joyful. In Shaiva Siddhanta tradition, Shiva as Nataraja (lit. "King of dance") is considered to be supreme lord of dance. Tandava takes its name from Tandu (), the attendant of Shiva, who instructed Bharata (author of the Natya Shastra) in the use of Angaharas and Karanas modes of the Tandava at Shiva's order. Some scholars consider that Tandu himself must have been the author of an earlier work on the dramatic arts, which was incorporated into the Natya Shastra. The Natya Shastra portrays Shiva narrating about the various aspects of the dance to the god Brahma. The 32 Angaharas and 108 Karanas are discussed by Bharata in the 4th chapter of the Natya Shastra, Tandava Lakshanam. Karana is the combination of hand gestures with feet to form a dance posture.