Loved the movie Avatar, and I think it was because I could find so many cultural variations of tree/nature symbolism and metaphor. Found this from the Kindling of Celtic Spirit When a tribe cleared the land for a settlement in Ireland, they always left a great tree in the middle, known as the crann bethadh (krawn ba-huh), or Tree of Life, as the spiritual focus and source of well-being. They held assemblies and inaugurated their chieftains beneath it so that they could absorb power from above and below. One of the greatest triumphs over its enemies was to cut down their sacred tree, their foundation of strength and support. What else do you think James Cameron took from mythology/history/anthropology?