(just for fun) Seated Buddha preaching the first sermon, from Sarnath, India, 5th century. Stele, sandstone, 63" high. Archaeological Museum, Sarnath.
An avatar is a manifestation of a deity incarnated in some visible form in which the deity performs a sacred function on earth; the number of avatars a deity has varies, with Vishnu usually having ten, or sometimes twenty-nine. (Gardner)