The consecrated fire forms the focus of devotions; it is often maintained on specific types of dung, wood, dried coconut (copra) and/or other combustibles. The fire-altar (vedi or homa/havan kunda) is generally made of brick or stone or a copper vessel, and is almost always built specifically for the occasion, being dismantled immediately afterwards. This fire-altar is invaribly built in square shape. While very large vedis are occasionally built for major public homas, the usual altar may be as small as 1 x 1 foot square and rarely exceeds 3 x 3 feet square. Again, whereas major altars at public events may include a hollowing of the earth to create a relatively deep pit, usual altars involve no such excavation and indeed rise only inches above the ground.