Final answer:
Sticking and shining clay are crucial to maintain its shape, ease the modeling process, and enhance the durability of the finished piece through better heat transfer during firing. The right moisture content is key for the consistency and plasticity of clay, which is achieved through the presence of minerals like feldspar and iron.
Step-by-step explanation:
Sticking and shining clay are important aspects of the clay modeling process. Preventing sticking is essential because it preserves the shape and integrity of the clay work, allowing for a smoother modeling experience. This, in turn, aids in heat transfer during firing, as it creates a more uniform surface by filling in gaps which increases the contact surface area. Shining, or polishing, the clay can enhance the finished look of the piece.
The moisture content of clay is a critical factor in successful modeling. Like kneading dough, the right moisture level is needed to give the clay the right consistency and plasticity. The fine particles of silt, including minerals like feldspar and iron, present in clay, contribute to its plasticity and color. These help in achieving the desired cohesion required for sculpting and pottery.
Once the modeling is complete, firing the clay in a hot kiln is crucial for durability. This process, used by ancient civilizations like the Nok, hardens the clay by chemically setting the shape and allowing it to maintain its form over time.