This is such a cool pathway with the circles and the pool with stones in the bottom! I really love the way the circle pieces of the pathway extend past the edge and go over the pool. I like that it isn't a harsh edge, that they kinds of mesh together.
This "Triple Bespoke Glass Sphere Water Feature" by Tills Innovations in the UK uses a polycarbonate sphere that fills with water and has water flowing down the outside of the sphere. This is the type (Diy Garden Waterfall)