In Africa for a example, people believe in things that are not real. Physically, it can't be proven but yet it is practised. It has cut so deep, and no one can change it right now.
It is believed in many culture that if you offer Kolanut and Seaman alcoholic drink to the ancestors by pouring it on the bare surface. The ancestor yield to your prayers or demands and begins to work for you.

Mathematically, In same Africa. If you give an equation to solve for X with no Y in the equation. It tells them automatically that the Y is invisible and during the equation solving, they will find a way to fix Y. Cos we feel X always correspond with Y...
Our psychological thinking is so fused that we think no other way.
Thanks for talking about this, It really help me to think deep