How to make a hemispherical form with a ball of clay and your thumb.
Form a ball of clay
Place the ball of clay in your palm and with your other hand press your thumb into the ball of clay.
Pinch and rotate
The pinch pots are formed by gently pinching the clay walls while rotating the sphere to even out and thin the walls of the pot. Pressure should be consistent and any cracks should be smoothed by rubbing across them as soon as they form.