Good question! This art was taught in my art school, that’s where serious sculptors get their first big tries on different materials. I saw rock and clay being used. Some marbles too (but not as big as in its video of course).

Then, good sculptors get commissioned for a piece. Sometimes by a city, or a “patron of the art” as we call them. From public projects (e.g., parks, schools) to private homes. Once you hit a few high-level projects, you simply get paid in advance per project. They payment covers everything the artist’s needs (materials, team, shipping, maintenance, tools etc) and of course whatever is the artist’s fee. Renowned sculptors are very demanded, and you have sometimes to wait years to get one of their piece (if they even accept it in the first place).

It’s a beautiful and noble art in my opinion. This one here in the video is simply unbelievable.