I went and saw it yesterday and I had a few ideas that support the matrix in a matrix idea. Basically the architect says his orignial ideas fail, the perfect one fails, his next attempt fails. The Oracle is created and comes up with a solution. Basically, I think that solution is Zion. The human mind refused to believe the Matrix, but a world outside where their fighting the machines seems much more likely. Even if it's something most people can only experience subcontously, the fact that it exists, allows people to believe. This makes more sense in my head, but basically, people won't believe just the Matrix, so an artifical outside world is created. I don't know, just something I though of, good movie. Seeya.