That is what I assumed when I first started drywalling. However, in the wild, I can't see such a solution working. Unlike the walls of a house, walls bedded on

That is what I assumed when I first started drywalling. However, in the wild, I can't see such a solution working. Unlike the walls of a house, walls bedded on soil move all the time. In the ever-moving domain of the Welsh hillsides, cement glue would crack within a year. Ideally, drystone walls are composed of two skins. The way the stones are arranged tends these skins to each incline inwards slightly. In this way, the wall as a whole acquires cohesion through physics.