Many tourists visit ancient abandoned cities every day in Latin America. They remain caught up when they see the walls built with large stone blocks. They are so arranged that no jewels can be placed between them.
How did this happen to people from the Stone Age?
They did not know metal, and walls were better than today's wall.
Neither archeology is clear how they have managed to sharpen the stone precisely. And they choked it so that they beat hard stones with hard stones.
The answer to these ignorance is essentially very simple!
When there are no metal tools of stone blocks it is possible to lash only the friction of stone on the stone. The friction is stronger and faster as larger blocks are interlocking each other.
The question is, how do the heavy blocks of heavy tons push forward back to the bottom block?
And the question of the answer is very simple.
It is enough to place on each side of the wall 4 large pyramid blades - in A form. There is a thick trunk hanging on that pyramid that can swing backwards. In that case, he struck the stone block and moved him a little forward. Then the same bump on the other side of the wall struck the stone on the other side. And so alternately until the stone blocks adapt to each other. The stone block is harder and the friction is greater, so the process is faster.
Interestingly, archaeologists have not found such a solution, although they often use the A-shaped pyramid pyramid, when digging wells, or something from deep holes. Obviously, their theory lies more in practice. Theoreticians are happy to read and design theories, but even illiterate practitioners often much better solve the problems that arise in the work.
And they are always the best of the simplest solutions, for which hundreds of people are not needed to implement them. Only two men are enough for the whole job.