Thousands of visitors stream into the Forbidden City regularly so barriers had to be posted around the relics. You may notice some major cracks in this relief art.
Over 300 bronze water barrels are situated throughout the Forbidden City. Other than for decoration, back in ancient times, they would be filled with water in case of fire. As you can see, barricades are there to deter further damages, but this visitor just had to touch it.
Signs and barricades like these beside each art piece was not unusual.