In our eternal quest to know ourselves "we" set out to create a reality where we would lose our connection to our source, forget that we were creators, and that all are One. It was not at all obvious how to create such a reality...
You can READ this article here http://divine-cosmos.net/constructing-the-separation-game.htm
Recommended Books and Websites:
The Ascension Papers - Book 1 by Zingdad