Who introduced the idea?

At this point, you may be wondering what purpose did these images serve? Were the stones actually the art work or were they intended to be used as printing plates! When did this discipline begin in the indigenous American societies? An interesting point is that the American Indians did not make paper as far as we know. They did have animal hides and paper like substances such as corn shucks and some types of tree bark. Who introduced them to the idea? Were the North American Indians actually far more mobile than we first thought? Did traders come from Meso and South America to trade goods with their neighbors to the north? This is probably true.