IIRC, it's true on the floor of the Pantheon, which is stone (atop what I think is roman concrete). The floor slopes towards a point below the oculus, where a d

IIRC, it's true on the floor of the Pantheon, which is stone (atop what I think is roman concrete). The floor slopes towards a point below the oculus, where a drain in the floor has been placed to get rid of rainwater. That said, I doubt anyone will be parking a new Mac Pro there anytime soon.