The technique is built by the use of an intricate system of foot-work. Pure dance (nritta) is all important where complex rhythmic patterns are created through the use of the flat feet and the control of sound of the ankle bells worn by the dancer. As in Bharatnatyam, Odissi and Manipuri, Kathak also builds its pure dance sequences by combining units of movement. The cadences are called differently by the names tukra, tora, and parana, all indicative of the nature of rhythmic patterns used and the percussion instrument accompanying the dance. The dancer commences with a sequence called That where soft gliding movements of the neck, eyebrows and the wrists, are introduced. This is followed by a conventional formal entry known as the Amad (entry) and theSalami (salutation).