Witold Giersz is a name I reference a lot in my posts about polish animation and with years they all came out it would be easy to assume Giersz is retired or even dead: but it is not so! The short movie this is trailer to came out in 2015 and his latest work came out in 2022/2023 (I've seen conflicting dates on that one).
And yes, this was animated on stones!
Sadly, as much as I would like to at least point towards a direction where to watch it we are all out of luck- it's not available anywhere. Unfortunately, it seems the best hope of seeing it is pastering any local animation festival. Still, I want to highlight how amazing animation is still being made in Poland to this day.