Dramatic poetry is said to have been invented by the sage Bharata, who lived at a very remote period of Indian history, and was the author of a system of music. The drama of these early times was probably nothing more than the Indian Nách-dance (Nautch) of the present day. It was a species of rude pantomime, in which dancing and movements of the body were accompanied by mute gestures of the hands and face, or by singing and music. Subsequently, dialogue was added, and the art of theatrical representation was brought to great perfection. Elaborate treatises were written which laid down minute regulations for the construction and conduct of plays, and subjected dramatic composition to highly artificial rules of poetical and rhetorical style. For example, the Sáhitya-darpana divides Sanskrit plays into two great classes, the Rúpaka or principal dramas, and the Uparúpaka or minor dramas. At the head of the ten species of Rúpaka stands the Nátaka, of which the '[S']akoontalá' is an example. It should consist of from five to ten Acts; it should have a celebrated story for its plot; it should represent heroic or godlike characters and good deeds; it should be written in an elaborate style, and be full of noble sentiments. Moreover, it should be composed like the end of a cow's tail; so that each of the Acts be gradually shorter.