Comment by sfink

That's a fascinating link, and it sounds like what I'm talking about is what's called "engineer's blue" in the link.

But I think it would be vastly more difficult to grind two massive stone blocks against each other than to just ram one against the other. Not unless you stacked them, anyway, and if you stacked them I'm not sure if you could move the top one side to side in order to do the grinding. Maybe with some kind of grit, I don't know. Still seems harder.

Also, grinding methods end up removing more material (bad for teeth!), and I would expect more overall physical work to be done in order to remove that material (bad for massively heavy stone blocks).

As for making them flat, that seems unnecessary to me. But then, I'm not a pharaoh. (Even for a pharaoh, it seems like only the seems would need to be straight. Nobody could tell about the faces after assembly.)

Then again, after some quick researching, it seems like there's a good chance that the well-fitting blocks (which are not all of them) may have been cast out of a concrete-like slurry, not hewn.