IMHO that man Perrin has a point. Although it's usually buried under the mass of long words and latin bits that characterise his writing. (Although "On and off the rocks" is still a great read). The point is not reductio ad absurdam (that's £10 you owe me JP..) the destruction of all cairns and removal of all traces of man from the hills, which is clearly a) an over-reaction and b) impossible. Rather that there are areas where the proliferation of unnecessary cairns detracts from the "hill walking experience" (whatever that might be) either in terms of scenery or diminution of physical skills - such as being able to navigate properly - or whatever. There have been many times when I have been very happy to spot a small cairn looming out of the gloom, but then I've also been happy to find a fiver lying on the pavement, but I don't rely upon it as a sole means of support. I've also spent hours in the rain knocking over useless cairns and scattering the rocks back around the hill in an inconspicuous fashion. Why on earth have two cairns next to each other, with their bases touching? Why have any say 2m apart? Or 10m? Cairns are a fact of life in the hills, they aren't going to all go away. (I don't get enough days off for that...). But we can improve the situation by some judicious destruction, acompanied by a little camouflaging of the remains rather than leaving a shapeless pile. So why not reduce the number of cairns, or reduce their height a little, tidy them up - they only need to be a few stones at most if they really are "needed" or at any rate inevitable. It's interesting that when I've talked to other walkers as I've been involved in cairn removal they have all - to a man or woman - said variations on the "well they're very useful and save lives" argument, one that has absolutely no evidence objectively whatsoever. With care, and an acceptance of their inevtability, it's perfectly possible to minimise the intrusion that they cause, if we just thought about it, or made (as usual)a little more effort. So knock down a carefully selected cairn today, that's what I say. And never, ever add another stone to the pile...