The animals know that you're doing something with stones. They understand that and certainly seem to appreciate structures. I've gleaned that from watching them. Oh here's the stone man. It'd be difficult to say they appreciated them aesthetically other than for their functions. As roost - look out spot - shelter etc. Human sensibility was very poorly developed back when the stones were put up - you can see that in the enormous amount of energy, time and effort, that went into building them, arranging them and so on. It's curious to see that a shop in Manchester is selling dried Fly agaric, one in Ncle too; it'd be interesting to watch those who were buying it.