I’ve gotten more than a few notes asking what this thing is… it’s a wooden “cow’s tongue” or a "Gyubera". This is a bent convex wooden rib that is used to compress and form the interior of forms on the wheel. It’s a traditional Japanese tool, that's darn useful tool to have on hand. I’ve had this one for almost 2 years now and I don’t think it’s ever been put away.Most supply houses carry these critters, but here's a special link to a fantastic suppler of Japanese clay tools.
Thanks for the tip Kitoi.