Sitting underneath a huge stone placed here by the people of the Pyrenees thousands of years ago, I was surprised at how weightless the mass above me felt. Like it was floating. The giant capstone touches the stones beneath in just a few places, so that there is a lot of space around the edges where light comes in and I can see trees and sky outside. Of course the slab of stone above me is actually super heavy and I can only wonder at the effort needed to move it here. I wonder at the momentum...