In the same way that clay is pinched to stretch it out and to make it thinner, it can also be manipulated to change its form and become thicker. It takes an understanding of what happens to the clay particles.
How to use your pinching skills to create a pinched teapot.
Video: Pottery demonstrations blog
Antoinette Badenhorst is a ceramic artist working with porcelain clay. She teaches potters all over the world in hands-on and online workshops. Antoinette is the author of many articles, blogs posts and the author of "Working with Porcelain"