As I mentioned, indigenous humans around the planet and throughout time created systems of tending the landscape. Some were more successful than others (three previous civilizations failed in China according to the archeological data). In fact, I've come to believe that any human dependent on the land they have access to and with enough resourcefulness time to experiment will come up with many of the strategies and techniques utilized in permaculture design. For example, weir systems harvesting from the tides are very similar between the Haida of the Pacific Northwest and those found on ancient British coasts.
From a more recent experience, my own grandfather developed gardens and systems in his many garden farms in the 1970s-90s. Despite his poverty and lack of education, he developed massive gardens at multiple sites that incorporated trees, shrubs, annual crops, hoop houses, poultry and rabbits. His plantings were on contour and used the light and microclimates to advantage. He used deep mulch to control weeds and keep pathways clear. He heated his home with scrap wood from the local sawmill, canned a massive amount of food. There was cold storage on a north-facing porch. Water was tucked away in gallon jugs, in case the well went dry. We foraged for nuts, mushrooms, wild medicines, and berries regularly.
There is a lot, looking back, that came from trial and error. His awareness of what was happening in his gardens (all five of them stretched over the county) was amazing. Frequently he would pause to show me some plant he'd imported and grown for the first time.
I am fairly certain he never heard of permaculture. A deeply conservative man, he likely wouldn't have been a Mother Earth News reader either. 🙂 That didn't stop him from being connected to the Earth and the cycles of creation and tending implied in permaculture.
Personally, I believe we all need to re-develop our relationship to the Earth (hence Touch the Earth), and to live in relationship to that Earth in a way that is mutually healing. In my journeys, I've connected with many others who share this perspective.