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Eight-direction Line Diagram is formed by The Thirteen Postures, including eight directions, four normal directions of martial arts; east, west, south, north, and four corners directions: northeast, northwest, southeast, southwest, combining with five steps: advancing, retreating, look to the left, look to the right, central equilibrium, The circular Eight-direction Line Diagram is from a square, forming from the rim of a circle through geometry principle. Taijiquan takes the direction, position and comfortable standing at the center extremely important. Whiling practicing Taijiquan, as long as there is Eight-direction Line, there will be an accurate central point. Because of this, the direction and position will be unmistakable, preventing from a mistake that " mall error can lead to a serious result."