LOST on Earth's Mirror Matter Moon - Reloaded by MikeNY

In short, yin-yang duality is, on multiple levels, the organizing principle of Lost, and it also explains the identity of the island. Many people have provided wonderful feedback over the years, and so this is largely a product of an ongoing conversation with the Lost community.

This is a very short version of what was once an overly-detailed theory:

http://mirrormattermoon.blogspot.com