“After watching the film Garbage Warrior, kiwi couple Nathan Rushton and Jess Fitzgerald were so inspired by Earthship architecture that they actually travelled to New Mexico to study Earthship Biotecture with pioneering architect Michael Reynolds.
Information on Wikimedia
I discovered an interesting website, www.wikimedia.org that posts lots of fun images and information on a multitude of topics and makes it available for use for free. I did a search there on various natural building techniques and the one on cob building netted the image shown below.