These kinetic water features in the Winter gardens added a nice touch of interest. The power of the water is used to make the feature move. In the case of this top one, the water is trapped in the sectioned channel around the rim of the skeleton globe. When one side is filled, the weight of the water pushes the globe into a downward spiral so that it slowly rotates round the rim.
Here, the leaves work in opposite pairs, like a see-saw. Water is captured on one leaf until it drops and releases a splash. The weight of the opposite leaf then pulls it back up to horizontal for refilling.
Predictably, both pools of water had been used as wishing wells, with a thin layer of small change spread across the bottom of each. I didn't see any notices, but I expect it is all gathered up and donated to charity.