Nataraja Swamy

When I visited Chidambaram Temple as a boy of twelve during a school tour , my teacher told me about Chidambara Rahasyam (secret of Chidambaram). Who will not be fascinated by that dancing Lord, Nataraja ? Since then, I have read many articles about this Secret . Each referred to one but no two was the same. I always thought that there must be a bigger secret than all I have heard.
Recently, I read something which took me nearer the truth in this pursuit of this secret of secrets. As usual, I am sharing here all that I learned upto now . Most of the statements are in numbered format and given as short as possible.