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Basic Throwing -
Pulling the clay
You are ready to pull the wall if the outside of the hump is
centered and the clay is opened in center. As your skill increases, it will become apparent that pulling can also have a centering function - many professionals use this technique. But as beginners, it will be important to pull from a well centered and opened form. If the opened hump is off center, the probable causes are either insufficient hand tension, allowing the rotating cylinder superior force, or
releasing pressure too quickly.
Pulling has three main purposes: thinning the wall, extending the form, and directing the shape.
Note: If further spreading of the bottom is needed, the indentation is made prior to pulling. The lowest portion of the wall is squeezed between a surface on the inside and another on the outside of the wall. This helps trim away excess clay which spreads out at the base of the wall by a method similar to the undercut described earlier, besides defining the base of the walls visually it helps the fingers in raising the clay up from the bottom of the pot.