So what's this about?
The height is such that it can just be seen from the couch. 'Dry stone' technology: no drilling, wires or cement - just gravity.
So far, no takers. I have quipped that they are waiting for the shower head and curtain.
Extending this thought and as we progress towards winter, I would certainly not be taking cold baths in the garden. Perhaps I should divert the Christmas lights so that a bulb or two is submerged? That would give them a heated swimming pool.