The Chidambaram Mahatmiyam composed during the 12th century explain the subsequent evolution and de-sanskritization. A unique feature of this temple is the bejeweled image of Lord Nataraja as the main deity. It depicts Lord Shiva as the master of Koothu-Bharata Natyam and is one of the few temples where Lord Shiva is represented by an anthropomorphic murthi rather than the classic, aniconic Lingam. At Chidambaram, the dancer dominates, not the linga as in other Shiva shrines. The Chitsabha houses a small sphatika(crystal) linga (Chandramoulisvara), believed to be a piece that fell from the crescent adorning Lord Shiva's head and installed by Adi Shankara. The linga is associated with the intangible fifth element, akasha (ether or space), the eternal infinite expanse where the dance of Lord Shiva takes place daily puja is offered to the linga and also to a small gem-carved figure of Ratnasabhapati. A whole year for men is said to be a single day for the gods. Just as six poojas are performed in a day at the sanctum sanctorum, six anointing ceremonies are performed for the principal deity - Nataraja in a year. They are the Marghazhi Thiruvaadhirai (in December - January ) indicating the first puja, the fourteenth day after the new moon (Chaturdashi) of the month of Masi (February - March) indicating the second pooja, the Chittirai Thiruvonam (in April- May), indicating the third pooja or uchikalam, the Uthiram of Aani (June–July) also called the Aani Thirumanjanam indicating the evening or the fourth puja, the chaturdasi of Aavani (August - September) indicating the fifth puja and the chaturdasi of the month of Puratasi (October - November) indicating the sixth pooja or Arthajama. Of these the Marghazhi Thiruvaadhirai (in December - January) and the Aani Thirumanjanam (in June - July ) are the most important. These are conducted as the key festivals with the main deity being brought outside the sanctum sanctorum in a procession that included a temple car procession followed by a long anointing ceremony.