For those that don't remember, it's a tree with a small stump that spouts water. I'm not sure how they made it, but it's been around probably since the 70's. It's the type of thing that used to be a lot more impressive and cute.
It's one of the old "Andyisms" I'm pretty sure. I forget his full name, but an Andy Something-or-other was responsible at one point for coming up with a lot of clever nick-nacks that were spread through the park.