Putting ideas into practice has been an important part of his approach. Dumfries House in Ayrshire has been renovated and turned into a training centre in a part of Scotland hit badly by the closure of local coal mines.
The film shows how this project has become an important local asset and economic driver, providing jobs and skills, training 10,000 people a year.
Highgrove, a quirky and characterful house in Gloucestershire, that seems allergic to straight lines, has become a living laboratory for his organic gardening and farming techniques.
The King is seen in Highgrove feeding chickens and collecting eggs, in a shed called Cluckingham Palace.
He also gives a glimpse of the outside of his “sanctuary”, a private place for his own personal reflection. Reflecting his deep interest in religion and spirituality, above the door is inscribed the prayer: “Lighten our darkness, we beseech thee, O Lord.”
The inclusivity of his beliefs are also suggested as we see him at a fire ceremony, alongside indigenous peoples wearing elaborate headdresses, at an inaugural “Harmony Summit” last summer.
There are glimpses in the film of Prince William and Prince Harry in archive footage, along with childhood images of King Charles.
There is an unexpected appearance from the Duke of York. Although in this case it is the name of a variety of potato that the King recommends as a good choice for baking.
“If you want to have a decent baked potato, which I love, you’ve got to have the crispy skins, so the red Duke of Yorks are very good,” he says.
The movie is promoting his world view about the interconnectedness of all things – and it is an example of how we are seeing more of the King as an inner man, beyond his role as a public figure.
It comes soon after an exhibition about another his personal passions, with his King’s Foundation displaying examples of icons that are an important part of the Orthodox faith.
It is an eclectic and international vision, with the film sweeping around examples of harmony in places including India, Guyana and Afghanistan.
But it is also a world in which the US politician we hear from is former vice president Al Gore, who has campaigned on climate change.
The King makes his own observation about his life of campaigning.
“Maybe, by the time I shuffle off this mortal coil, there might be a little more awareness… of the need to bring things back together again,” he says.