Why can't the Forbidden City take pictures of ancient costumes on the central axis?

In fact, the Forbidden City does not explicitly prohibit taking pictures.

The walls of the Forbidden City are thick, warm in winter and cool in summer. Even if the sun is shining outside, it will feel cold inside the Forbidden City. In addition, the buildings are old-fashioned, so the role of summer is more obvious, and it is particularly cold in summer. In fact, the Forbidden City does not explicitly stipulate that you can take photos, but generally according to the traditional customs of the older generation, you will not take photos with lions. According to the old man, the lion's aura is too strong, which is used by the royal family for the town house. If you take a photo with a lion, it is easy to be suppressed by wealth and bureaucracy.