 On the appointed day in the presence of the head of state, a government official climbs on to the chariot and holds up a jewel-studded black vest from the four sides of the chariot so that all the people gathered around can have a look at it.The display is a re-enactment of an event that happened eons ago.According to legend, a Jyapu (Newar farmer) lost the vest which he had received as a gift from the serpent god Karkotaka Naga for doing him a favour.