Kummattikkali is a mask dance popular in some of the northern districts of Kerala. The dancers, wearing painted wooden masks and sporting sprigs of leaves and grass, go dancing from house to house. A popular Kummatti character is Thalla or the witch; the others represent various Hindu gods and goddesses. The songs deal with devotional themes and are accompanied by a bow like instrument called Ona-villu. No formal training is required to perform the Kummattikkali, and often the spectators join in the performance.