I'm just curious if an embedded slide or some kind of masonry slide is an option in this type of design. The reasons I ask is, first, the slide obviously doesn't match with all the stone, and second... I was backpacking a while back and we came accross a small river that had carved its way straight through large rocks. We ended up sliding down it and off of a waterfall. Was curious how ridiculous something like that would be to recreate.