At first, people used air as a medium of transmission. Later, people needed a harder form of transmission. In that, people began to use rocks and such to write things down. Later on, they used caves as they had moist walls, in that, they were easy to put script on. They would write on higher areas of the walls as to prevent any displacement of the written text. The cheif weakness of a cave was that one could not transport the text. In that, the nomadic people could not bring the text with them.
Later, stone became the next medium. It offered mobility, but it does have its drawbacks. The rock was very difficult
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