On the day of Shivratri, a three-tiered platform is built around a fire. The topmost plank represents swargaloka (heaven), the middle one antarikshaloka (space) and the bottom one bhuloka (earth). Eleven urns or kalash, are kept on the swargaloka plank symbolising the eleven manifestations of the Rudra Shiva. These are decorated with bilva (woodapple leaves) and mango leaves atop a coconut representing the head of Shiva. The uncut shank of the coconut symbolises his tangled hair and the three spots on the fruit Shiva's three eyes.