Nataraja Shiva and his "dance of bliss" is an ancient Hindu art concept. It is found in various texts such as "Tatva Nidhi" which describes seven types of dance and their spiritual symbolism, "Kashyapa Silpa" which describes 18 dance forms with iconographic details and design instructions, as well as Bharata's ancient treatise on performance arts "Natya Shastra" which describes 108 dance postures among other things. Reliefs and sculptures of Nataraja have been found across the Indian subcontinent, some dating to 6th century and earlier such as in Aihole and Badami cave temples.