(Some of the pictures are out of order, but that seems to be the Blogger way...)
They have recycled a lot of items in their outbuildings that most people would have through out. Such as old windows for cold frames and for one of their 'greenhouses'. A lot of structures look strange because of it, but I for one think it is a great use of recyclable goods. Better than filling the landfill!
(From http://en.wikipedia.org/wiki/Permaculture )
Permaculture is an approach to designing human settlements and agricultural systems that are modeled on the relationships found in natural ecologies.
Permaculture is sustainable land use design. This is based on ecological and biological principles, often using patterns that occur in nature to maximise effect while minimizing wasted energy. Permaculture aims to create stable, productive systems that provide for human needs, harmoniously integrating the land with its inhabitants.