On Paperclay

From Rosette Gault's website on paper clay:
Unlike traditional ceramic, properly blended paperclay can expand and contract its shape in the air without fracture, has double green strength and other distinct properites before or after fire to temps of 1000C-1380C (or higher).
With the right ratio of cellulose fiber distributed uniformly through the clay the hollow celllulose fibers serve like cappilaries to wick and distribute water deep inside and outside the clay....expanding and contracting as it goes from dry to wet and vice versa.

Read more and see cool pictures here.

Here are some paperclay enthusiasts with lots of links.