In Avatar, we see MANY interactions between the "real" world and the spirit world.
1) We know that Aang, and Aang alone is the bridge between the world and the spirit world. However, Iroh has been to the spirit world.
2) We know that the "world" of spirits is very different from our own - for example, Koh's swamp.
3) We know that spirits have the ability to travel between their and our world
4) We know that spirits can manifest themselves into physical forms - Tui and La.
5) We know that spirit can manifest iteself in a certain period of the lunar cycle and physically and emotionally wreak havoc on an unsuspecting town ;D (Hei Bai)
6) We know that some - not all - spirits are dead (Roku, Kyoshi), and others have been alive since before recorded history (Koh, Tui, La, etc..)
7) We know that some spirits can keep themselves in (presumably) their raw spirit form (and apparently, run a 100-story library while they're at it.)
What are the rules that govern the spirit world? Is this just an example of the chaos theory?
Speculations?
Discussion?
Comments?
etc...?


