Just like for us now, bicycles are not so precious, so we will treat them at will. Maybe thousands of years later, our bicycles will become those antiques and then be treasured, just like these stone tablets.
And everything will not be so completely preserved, even if it can be cherished, it will also experience the destruction of time. Because the molecules are constantly moving, some tiny molecules on the stone tablet are constantly spreading into the air, that is, the components on the stone tablet will be less and less. At the same time, many things will undergo slow oxidation reaction, many substances in the air will undergo chemical reaction, and weathering will occur due to the reduction of moisture. These are the reasons why the stone tablet may be damaged.
A small part of the reason is that the people who portrayed the back at that time were not good enough. Maybe it's just one of his random works. He found a stone at random and painted it. In addition, it was not as high-tech as we are now, and it was carved with some relatively simple tools, so it was not so fine.