Chinese calligraphy uses four traditional tools: brushes, ink sticks, ink stones, and paper. Brushes are made from animal hair and come in hard, soft, or mixed tips. Ink sticks are made from pine, oil, and lacquer and are used to make ink by grinding on an ink stone. Paper was invented in China and various papermaking techniques were developed. Proper technique involves correct posture, knowledge of tools, control of the brush, rhythmic flow of strokes, and balanced lines. Stroke sequence follows rules such as starting at the top and moving downward, starting on the left and moving right, and completing inner parts before outer.