Back on flat ground you can see they've lined the edge of the pool with some nice flat stones making a nice rim, suitable for sitting on when you want to cook only your feet.
The minerals in the water are what accumulate and create the rock formations. They're quite lovely and a little suggestive.
The white balance on the camera was set to "Lobster". No, wait, tha's me. And Twil. Everybody say "Hi Twil!"
Here's the wellspring of one of those trickles. I said hot. I meant it. I didn't fill this little divot with my Perrier.
Think I'm kidding? Think again: