um bom principio de design em:
There is an interesting book called The power of duck by Japanese farmer Takao Furuno who discovered permaculture for himself. He was planting rice the traditional way and was wondering why it was so much hard work. He then realised, that if he held a duck family in the fields, their pedaling legs would take away a lot of the work he had to do. Then he discovered, that certain little fish in the fields would feed and keep the ducks and he slowly kept stepping up the productivity ladder of the animals and had very little to do in the end.
about permaculture
Today, permaculture can be described as a “moral and ethical design system applicable to food production and land use,” as well as community design. It seeks the creation of productive and sustainable ways of living by integrating ecology, landscape, organic gardening, architecture, agroforestry, green or ecological economics, and social systems. The focus is not on these elements themselves, but rather on the relationships created among them by the way they are placed together; the whole becoming greater than the sum of its parts. Permaculture is also about careful and contemplative observation of nature and natural systems, and of recognizing universal patterns and principles, then learning to apply these ‘ecological truisms’ to one’s own circumstances in all realms of human activity.
in_ http://en.wikipedia.org/wiki/Permaculture
and
http://www.tagari.com/item.php?itemid=1
Nós por cá temos alemães e holandeses a vender “piscinas biológicas” nenúfares e rãs incluído