This stone tells a story about the pharaoh Shabaka. One day Shabaka was visiting a temple in Lower Egypt. During his visit he saw some old papyrus scrolls that had been damaged by insects and rodents. When he learned that a creation story was written on the damaged papyrus scrolls, Shabaka was not happy.
Shabaka decided that the creation story should be carved into stone so that it would be preserved forever. Thus, the story of Shabaka and the papyrus scrolls, as well as a creation story, were carved into this stone.
Many years after it was carved, this stone was taken out of the temple and used as a grinding stone for grain. That is why it is deeply carved in the centre.