More Wierd Rocks

So, apprently, these rocks form underground. Due to seismic activity and heavy pressure, pockets of water form. Slowly, those pockets are replaced with minerals that precipitate out of water (like stalagtites I guess). Then a ball of rock forms. Then the land is eroded and the ball is BORN into the world. I prefer to imagine they are carved by pink desert gnomes who have been influenced by the serverity of line of japanese gardening. Whatever you wish.