It would take the laser-like lawyer's mind of Minister for Treaty Settlements Chris Finlayson to explain it, and even then you may be none the wiser.
What we have is a Westernised legal construct wrapping itself around an indigenous world view. Whether those two elements will prove a perfect match only time will tell as the realities of the agreement play out over the years.
But the purpose of the edict passed by Parliament on March 15 seems clear enough and above argument - preserving the health and wellbeing of the Whanganui.
Our waterways are wondrous and life-sustaining, and yet they are under threat from pollution and exploitation. They need guarding, and the Whanganui has gained two guardians, representing the Crown and iwi.
If they can give us a cleaner, healthier river that benefits the eco-systems within it and the people around it, we should be grateful.
Maybe this law can help clean up the Ganges as well.