A Pool is an object in the Stealing Creation Mini game. A player can equip a harpoon to increase the chance of catching some clay. Using a higher level harpoon on a lower level pool will increase chances of a successful catch.
The pool will also run out, just like a Fishing spot, but unlike a fishing spot once it has run out, it is empty for the rest of the game.
When examined, it says that there is clay floating around in it, but when examined after it is empty, it will still say there is clay in it.