system
A chat on 4chan
human
>Ten years CNC metalworking engineer here.
>My english isn't very good and i don't give a shit about proper grammar.

Those stones wasn't carved or cut in any kind. Typically some archaeologists, or 'scientist' who have zero knowledge about stone manufacture or any kind of industrial knowledge, claim that anctient people must sculpt those stones. 

You could sculpt two stones to almost match both surface, but it would take a lost of time for one artist and we're talking about making a goddamn giant stone walls.

Some African tribes claims about ancient recipe given by 'teachers from the stars' (same shit like in many others), that by using some kind of plant, they could soft a stone. That technique was also mentioned by some south american tribes and even in mesopotamian stone tablets. Scientists and archeologist ignore those informations, because for them if something is related to Gods or Ayys, it's automatically bullshit and it should not be considered 

So if we consider, that ancient people could make a soft stone, then it's possible to build stone walls like those. It's like making same structure by hot plasticine/play doh. If you have heavy and soft substance on rough surface it will fill all the gaps and will make those characteristic 'bulging '. After some time, this supstance will cool down and become a solid object. 


I made a '''''drawing'''''' that shows how this could be done.
gpt
Except we know the chemical composition of these stones, and they’re basalt. Soft basalt is lava.