My students are constantly amazing me.

I gave one permaculture course in Botswana, and now my students are out in the bloody desert in Namibia teaching Bushmen - whose language nobody can speak - to be very good permaculture people.

We don't have any power of creation - we have only the power of assembly. So you just stand there and watch things connect to each other, in some amazement actually. You start by doing something right, and you watch it get more right than you thought possible.

I confess to a rare problem - gynekinetophobia, or the fear of women falling on me - but this is a rather mild illness compared with many affluent suburbanites, who have developed an almost total zoophobia, or fear of anything that moves. It is, as any traveller can confirm, a complaint best developed in the affluent North American, and it seems to be part of blue toilet dyes, air fresheners, lots of paper tissues, and two showers a day.

Once you've said to yourself, "But I'm not using my physics in my house," or "I'm not using my ecology in my garden, I've never applied it to what I do," it's like something physical moves inside your brain. Suddenly you say, "If I did apply what I know to how I live, that would be miraculous!" Then the whole thing unrolls like one great carpet. Undo one knot, and the whole thing just rolls downhill.

There are a few societies that show signs of having been very rational about the physics of construction and the physics of real life. Some of the old middle-Eastern societies had downdraft systems over whole cities, and passive, rapid-evaporation ice-making systems. They were rational people using good physical principles to make themselves comfortable without additional sources of energy.

Security can be found in renunciation of ownership over people, money, and real assets; to gain, keep or protect that which others need for periods of legitimate access. A lending library enables people to help themselves to information; a locked-up book collection is useful only to the person who owns it.