illustrious bloodlines, are venerated and can be called upon to aid the living. On the fourth day after death, the urvan is reunited with its fravashi, whereupon the experiences of life in the material world are collected for use in the continuing battle for good in the spiritual world. For the most part, Zoroastrianism does not have a notion of reincarnation. Followers of Ilm-e-Kshnoom in India believe in reincarnation and practice vegetarianism, among other currently non-traditional opinions, although there have been various theological statements supporting vegetarianism in Zoroastrianism's history and claims that Zoroaster was vegetarian. In Zoroastrianism, water (aban) and fire (atar) are agents of ritual purity, and the associated purification ceremonies are considered the basis of ritual life. In Zoroastrian cosmogony, water and fire are respectively the second and last primordial elements to have been created, and scripture considers fire to have its origin in the waters (re. which conception see Apam Napat). Both water and fire are considered life-sustaining, and both water and fire are represented within the precinct of a fire temple. Zoroastrians usually pray in the presence of some form of fire (which can be considered evident in any source of light), and the culminating rite of the principal act of worship constitutes a "strengthening of the waters". Fire is considered a medium through which spiritual insight and wisdom are gained, and water is considered the source of that wisdom. Both fire and water are also hypostasized as the Yazatas Atar and Anahita, with worship hymns and litanies dedicated to them. A corpse is considered a host for decay, i.e., of druj. Consequently, scripture enjoins the safe disposal of the dead in a manner such that a corpse does not pollute the good creation. These injunctions are the doctrinal basis of the fast-fading traditional practice of ritual exposure, most commonly identified with the so-called Towers of Silence for which there is no standard technical term in either scripture or tradition. Ritual exposure is currently mainly practiced by Zoroastrian communities of the Indian subcontinent, in locations where it is not illegal and diclofenac poisoning has not led to the virtual extinction of scavenger birds. Other Zoroastrian communities either cremate their dead, or bury them in graves that are cased with lime mortar, though Zoroastrians are keen to dispose of their dead in the most environmentally harmless way possible. For a variety of social and political factors the