There was an ancient book on dance ( Kooththa Nool ) written during Tamil Sankam period.
This book was thought to be lost. But from a mail thread, I understand that some body had a possession of it and first few chapters were printed. But the published died and the remaining were lost again..
Are u refering to the book which attepts to reconstruct various yazhs based on sangam and post sangam literature? It was written by Swami Vipulanandha adigal. Do u have a copy of 'kooththa nool'?