On the way from Wenling Road to Banling Palace, there is a strange slope. What makes it strange is that objects roll from the bottom to the top of the slope. No matter how you try it, it is always the same. This "strange slope" has since been assessed. The results have confirmed that the so-called "slope bottom" is actually about 1.395 meters higher than the "slope top". The slope is at 2%. The surveyor has concluded that the strange slope is actually an optical illusion caused by people's visual reference to the surrounding objects.
Zhen Zhen Jiang Mu Ya Hai Xian Dian( Zeng Cuo An Dian)