Is the Stone made of cement? Rand near the end of TGS describes the colour of the walls as "the colour of wet sand". He also says it is "unnatural". It's seamless, smooth. Smooth here may be an issue: is it smooth as in it has no hard angles, or smooth as in its surface has little friction? Obviously, if the second is true then it can't be cement. If it isn't some unknown, Power-wrought material, what could it be?
Sorry for the ramble, but I would love to hear you ideas!
Sorry for the ramble, but I would love to hear you ideas!

