Golden door studs on the gates of the Forbidden City must be odd in number, representing yang, and it was believed that women who touched them would give birth to sons.

Chu Can, an expert with over 20 years of research on the Forbidden City, stated that the architecture there does contain pig blood but not for exorcism.

Over 200 vats, scattered throughout the Forbidden City, served as an important layer of protection for the imperial family.