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A very important aspect of the wall was communication between the army units.

The first magnetic compass was invented in China probably during the Qin dynasty (221-206 BC).By that time the Chinese already possessed the techniques of wall-building.However, the first materials used were rammed earth, stones, and wood.China was the land of numerous inventions that played an important role not only for the Chinese but for the rest of the world as well.The Four Great Inventions of ancient China include papermaking, the compass, gunpowder, and printing.