There is no top.

I once told Mrs. Mosley about what I tend to do when I start getting bored at meetings and training classes: Basically, I picture the architectural layout of the building I'm in, then I try to imagine what would happen if the gravity changed to a given sideways direction. How would I navigate around the building? Which long hallways would become sheer cliffs?

Well, all of this came to mind when I saw the teaser for Christopher Nolan's upcoming Inception. It looks like old Christopher is getting his Matrix on, but in a good way.