URUVAM, ARUVAM AND ARUVURUVAM: (roopa, aroopa and aroopa-roopa) FORM,FORMLESS AND FORMLESS- FORM The verse six of the SGB tells the the three types of the form of sivam. we see in the Chidambaram three forms of siva. They are 1.the nataraja (uruvam) 2. an empty chamber (aruvam) 3. aruvuruvam(siva lingam) The empty chamber in chit-sabai is very popular among people. This is called the chithambara rahasyam. The rahasya is that god is formless,invisible and omnipresent. The aruvuruvam is the lingam. Formless-form. Nobody can say what is the form.Yet a form. It is very abstract. This formless form is lingam. The nataraja is the uruvam. Here god takes the form of a man there fore he is in a roopa state. The sivagnan bodham describes the need for these three concepts.
UNAR-URU YENIN ASATHU: The sivam if it has a identifiable image then it would only mean to people a perishable object.(like the anthropomorphic image lord nataraja) UNAR-AADHU YENIN INMAI: The sivam if it has no image at all then no one will easily understand it. (like the chidhambara rahasyam) IRU-THIRAN OR IRANDU-VAGAI SIVASATHU: This form is either identifiable and un- identifiable . that is by the higher knowledge of sivam we can understand this image. But by lower mundane human knowledge we cannot imagine this to anything. (This form is the siva-lingam). Thus, FORM=ROOPAM=URUVAM=NATARAJA FORMLESS=AROOPA=ARUVAM=RAHASYAM FORMLESS FORM=AROOPAROOPA=ARUVURUVAM=SIVA-LINGAM The sivagnanabodham clears these basic issues in the 6th sootram