If you turn wood thin enough, it won't check. Instead it'll bulge.
Like if you imagine making a bowl from a whole log, center included.
Normally that would split, but if you turn it wet and make it thin enough, the center of the log will make a bulge and get rid of the force from radial+tangential schrinkage that way.
Let me see if there are some pictures of Bert Marsh's work to steal from the internet.
He did a lot of bowls like that.
I took a course with him about 15 years ago, he was one of the great English master turners, sadly he died this year.
Here is an example, you can clearly see the bulge in the log center:
Go check Bert's stuff out here, from a Del Mano exhibition.
I think you'll like it, very clean forms, no frills, just lovely woodwork:
http://www.delmano.com/exhibitions/2010/mainExhibitions/BertMarsh2/exhibition_01.htm