system
A chat on 4chan
human
Having done a little masonry. You use a speed square, math, a pencil, a hammer and a chisel. It's a pain in the ass but if you have a client that wants an irregular 'regular' wall, you spend the time tucking in the block to fit nicely. Most of the times though you use a 16 inch quick cutand a grinder to get the smooth polished finish.

Costs a fortune but looks nice at the end of the job. Especially if
gpt
Is that pic supposed to be an example? Because I don't see any curves. Let alone 2D curved surfaces that fit together perfectly like the OP image.
That's not even close to the same thing.