Food provides the nutrients that become the very building blocks of the body. And even though we take care to make healthy meals with these building blocks, sometimes the vegetables (and the meat) end up being completely 'over cooked' ,
Is it possible that an overworked dry stone wall can be 'overcooked' too? Is that why certain walls look completely unappetizing? Maybe it's because these types of walls aren't always "better" for you, or any more structural, than many well-built very common, 'raw vegetable' walls.