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Pottery techniques have —remainedremainingremainremains relatively unchanged in some traditions for centuries, with potters still —kneadingkneadkneadedkneads clay by hand to remove air bubbles before shaping it on a wheel. Firing temperatures must be —carefullycarefulcarecarefulness controlled, since even minor fluctuations can cause pieces to crack. Glazes are then applied to —makemakingmademakes the surface both waterproof and decorative.