Depending on the size of the kiln, it took between one and six weeks for the fire to complete a full circle.
Wood, steel, aluminium, iron, glass, paper, plastics, copper, silicon, nickel, titanium, electronic grade silicon.
The craftsmanship associated with timbrel vaulting has long vanished, but the achievements are still with us today.
What will remain of greentech, cleantech and ecotech if nanotechnology turns out to be harmful for humans and the environment?