for more info on Ursula, here's a great sight:http://www.art.net/studios/sculptors/ursula/
Circular Logic: Using Balloons as Molds for Spherical Handbuilt Ceramic Sculpture
This post was excerpted from Ceramic Art: Innovative Techniques, available in the Ceramic Arts Daily Bookstore. The full article includes information on how Ursula finishes these pieces by wood or raku firing them.
I feel there is something unexplored about woman that only a woman can explore. Georgia O'Keeffe