There is an official hat on the wall of Yimen, so you can't build a shed, which has an impact on the gate. If the official hat is hung on the wall of Yimen, it is generally not recommended to build sheds or other structures on it. This is because the existence of official hats is usually related to the identity, authority or status of officials. On the premise of protecting and respecting official symbols, it will be considered inappropriate to build a shed, which will have a negative impact on the image and authority of the gate.