A crash course in changing the world.
I am aware that the idea of three/four-field crop rotation is not traditional knowledge in particular as it started in the 11 century in Europe. However this form of agriculture was cultivated in Europe and is applied in organic farming as well - as it minimizes soil erosion. This kind of traditional knowledge (is and) can be easily transfered to other contexts and the picture that I found easily describes this idea.
Sorry folks - I know this fulfils maybe only partly this weeks mission - but I believe that this is at least something :-)