Permaculture principles are like (and borrow from) those that underlie Native American agriculture. Natives did not have refridgerators to convert to dehydrators so one is not "like" the other because permaculture is far too all-inclusive to make a one-to-one comparison.
It is a semantic argument but an important one to most people trying to understand this new groovy term. Like saying P-Diddy is Like Stevie Wonder. No. P-Diddy took from Stevie Wonder and regurgitated it. I had to correct some young urban youth in Oakland who, upon hearing a Stevie Wonder tune said, "hey, he took that from Diddy". HEELLLL NO! Let's be honest about the sources of our ideas.
The convenience of the umbrella term Permaculture can also potentially discredit it. How much "doing" of permaculture qualifies as permaculture?
I have chickens-- does that count? Well, they are technically in Zone 3 of my
yard so maybe I'm not "doing" permaculture. If I moved them closer to my house.....?
What if I make a big pile (hugelkulture), let my pigs dig through it, convert my fridge into a
solar dehydrator, but drive a Hummer to and from my community garden plot and when I get lazy go to Walmart for a cheap piece of Chinese kitchen aiding device? Am I still "doing" permaculture?