Personally, I'm beginning to feel the way the older architects seemed to create architecture that appeared more natural and naturally melding with their sites was very much a two step process.
The actual construction of man-mde architecture, and attempting to create site natural "lines" in their architectural construction was the first step but the clever and studied use of grasses and such to create a more natural and rugged look (particularly off the immediate playing surfaces) was the very necessary second and final step to them.
Often, in the Modern Age of architecture, the second step of natural and rugged grassing (particularly off the immediate playing areas) doesn't exist at all, or extremely minimally. And this too often gives entire sites (and courses) and overly immaculate (and man manicured) look and feel that's anything but natural looking or melding into a natural site which is generally random and slightly unkempt looking!
Doak, in his book on MacKenzie, gives one of the more interesting sideline analogies into this particular area I've ever seen in a golf architectural book.
It's clear that MacKenzie's thoughts and experimentations with natural camouflage was unique and potentially extremely effective, if used properly, in the era of military warfare in which he lived and participated.
MacKenzie's ideas on how to create camouflage in warfare not only required a certain process of construction (trenches and such) but also that the soldiers themselves build and create it and often necessarily very quickly!
It never ceased to annoy MacKenzie, apparently, that military leaders, on his side, could never seem to desist from forcing their soldiers to act and think extremely neat and look neat in almost everything they did, which very unfortunately for them included constructing trenches and such that exhibited man manufactured looking straight and squarish lines that was definitely recognizable as anything but blending and melding into the natural terrain! And as such it was completely recognizable by the enemy! This is the exact opposite of the methods and mentality that the Boers exhibited and so successfully in trenching and warfare!
To Mackenzie, it was absolutely necessary that the soldier, in both look and also in his trench constructing mentality, when creating camouflage, should think and act anything but NEAT! He should think, act and look just the opposite in fact--random and unkempt, just as nature was!!
It was never lost on MacKenzie, apparently, that no military leadership, on his side, he was aware of, could seem to make that all important connection as it related to effective camouflage!
He'd probably feel the same about some of the so-called "Modern Age" golf architecture today if he could see it. The specific "first step" construction of the architecture, in some cases today, may be passable to him but he'd also probably ask, (petulantly as usual), why the need for all this man-manicured immaculatness everywhere if you're trying to make a golf course look natural and blend and meld into the basic look of all that nature is?