Nice and simple one for you today Rooi.
It has two parts. Part one is how and part two is why.
1) Take a 1000mm x 1000mm granite surface. Describe to me how you would flatten this surface so that the it is flat to within 1/20 the thickness of a human hair. Note that you are only allowed copper, bronze and meteorite tools.
2) Considering the difficulty of this task, explain why you'd want such precision if it has no bearing on the function of the final product.
I await your sarcastic, vague and unproductive answer.
Thus, I'll also open the floor to anyone else that may want to try their luck.
PS I don't know the answer...obviously.