How porcelain is made and where is porcelain made are three different things haha
The xxl porcelain tiles are perfect copies of real slabs of marble.
They take a slab, and photograph it, they then 3D print the slab on to the porcelain.
Most often, the easiest way to create different designs of the same slab is to move the print along 10% and reprint. That way they get a tile that only repeats every so many tiles, but it all taken from 1 slab.
Help?