maybe i should have said "softened". there is the theory of geopolymers. a process used for making the ancient megaliths around the world fit perfectly with one another.
of course this is not proven, its just a theory, but if you can soften these massive stones to the point where there are no gaps, then you can do whatever to a malleable piece of granite to turn it into am impossibly perfect shape. this falls into "ancient high technology", stuff Chris would laugh at. he probably thinks this is a big setup to bring up that theory. these weird fitted rocks are found all over the world. including the Menkaure Pyramid in Egypt.