I took the hierarchical numbering system to be an indication of progressive enlightenment. If we take for granted that it's based in our own world, and things such as Evolution and Enlightenment have the same histories in the world of "G", then stating that Chimps are a six and humans a seven implies that humans can eventually become koalas, then...well, for lack of a theoretical God, let's call 9s simply "creators"...with a ten being the unknowable creator of creators...
...so in the end, when the CG spectacle resolves itself into the eye of "M", I took it to mean that a representative part of "G" was alive within her, and possibly even that she had taken a large step toward becoming a 9.
Is this a happy ending? Maybe in the same way that Blue Velvet had a happy ending. Because, in truth, the Creator is now gone, and humanity is left to figure it out on its own...or was there a line of dialog indicating otherwise? I forget.
Regardless of my probable misinterpretations: Great work, Mr. August. If I hadn't already spent all of my tears on The Fountain, the pervading and conclusive beauty of your construction would have had me bawling through the credits.
